diff --git a/README.md b/README.md
index 57d93b3..fd21cca 100644
--- a/README.md
+++ b/README.md
@@ -140,7 +140,8 @@ const main = runtime.module(define, Inspector.into(document.body));
 
 <a href="#compile_cell" name="compile_cell">#</a>compile.<b>cell</b>(<i>contents</i>)
 
-Returns an object that has `define` and `redefine` functions that would define or redefine variables in the given cell to a specified module. `contents` is input for the [`parseCell`](https://github.com/observablehq/parser#parseCell) function. If the cell is not an ImportDeclaration, then the `redefine` functions can be used to redefine previously existing variables in a module. This is an asynchronous function because if the cell is an import, the imported notebook is fetched.
+Returns an object that has `define` and `redefine` functions that would define or redefine variables in the given cell to a specified module. `contents` is input for the [`parseCell`](https://github.com/observablehq/parser#parseCell) function. If the cell is not an ImportDeclaration, then the `redefine` functions can be used to redefine previously existing variables in a module. This is an asynchronous function because if the cell is an import, the imported notebook is fetched. 
+Note: Calling the define method will return the variables created as an array. This can be helpful to remove unnamed variables or multiple cells imported using import statements when creating an editor interface to remove previously defined variables.
 
 ```javascript
 let define, redefine;
@@ -165,7 +166,7 @@ await main.value("c"); // 22
 define(main); // would throw an error, since a is already defined in main
 
 {define} = await compile.cell(`x = 2`);
-define(main);
+define(main); // this will return an array, example:[variable_for_x]
 {define} = await compile.cell(`y = x * 4`);
 define(main);
 
diff --git a/package.json b/package.json
index 7699815..d4270ac 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   "scripts": {
     "build": "rollup -c",
     "format": "prettier --write src/**/*.js",
-    "test": "npm run build && tape 'test/**/*-test.js' && npm run test-format",
+    "test": "npm run build && tape test/*-test.js && npm run test-format",
     "test-format": "prettier --check src/**/*.js",
     "test-html": "http-server",
     "prepublishOnly": "npm run build",
diff --git a/src/compiler.js b/src/compiler.js
index 9e80d50..7172021 100644
--- a/src/compiler.js
+++ b/src/compiler.js
@@ -156,6 +156,8 @@ const createCellDefinition = (
   dependencyMap,
   define = true
 ) => {
+  let variables = [];
+  let tmp_variable_store = null;
   if (cell.body.type === "ImportDeclaration") {
     const {
       specifiers,
@@ -164,13 +166,14 @@ const createCellDefinition = (
       importString
     } = setupImportCell(cell);
     // this will display extra names for viewof / mutable imports (for now?)
-    main.variable(observer()).define(
+    tmp_variable_store = main.variable(observer()).define(
       null,
       ["md"],
       md => md`~~~javascript
 ${importString}
 ~~~`
     );
+    variables.push(tmp_variable_store);
 
     const other = main._runtime.module(
       dependencyMap.get(cell.body.source.value)
@@ -178,9 +181,15 @@ ${importString}
 
     if (hasInjections) {
       const child = other.derive(injections, main);
-      for (const { name, alias } of specifiers) main.import(name, alias, child);
+      for (const { name, alias } of specifiers) {
+        tmp_variable_store = main.import(name, alias, child);
+        variables.push(tmp_variable_store);
+      }
     } else {
-      for (const { name, alias } of specifiers) main.import(name, alias, other);
+      for (const { name, alias } of specifiers) {
+        tmp_variable_store = main.import(name, alias, other);
+        variables.push(tmp_variable_store);
+      }
     }
   } else {
     const {
@@ -191,12 +200,15 @@ ${importString}
     if (cell.id && cell.id.type === "ViewExpression") {
       const reference = `viewof ${cellName}`;
       if (define) {
-        main
+        tmp_variable_store = main
           .variable(observer(reference))
           .define(reference, cellReferences, cellFunction);
-        main
+        variables.push(tmp_variable_store);
+
+        tmp_variable_store = main
           .variable(observer(cellName))
           .define(cellName, ["Generators", reference], (G, _) => G.input(_));
+        variables.push(tmp_variable_store);
       } else {
         main.redefine(reference, cellReferences, cellFunction);
         main.redefine(cellName, ["Generators", reference], (G, _) =>
@@ -207,13 +219,20 @@ ${importString}
       const initialName = `initial ${cellName}`;
       const mutableName = `mutable ${cellName}`;
       if (define) {
-        main.variable(null).define(initialName, cellReferences, cellFunction);
-        main
+        tmp_variable_store = main
+          .variable(null)
+          .define(initialName, cellReferences, cellFunction);
+        variables.push(tmp_variable_store);
+
+        tmp_variable_store = main
           .variable(observer(mutableName))
           .define(mutableName, ["Mutable", initialName], (M, _) => new M(_));
-        main
+        variables.push(tmp_variable_store);
+
+        tmp_variable_store = main
           .variable(observer(cellName))
           .define(cellName, [mutableName], _ => _.generator);
+        variables.push(tmp_variable_store);
       } else {
         main.redefine(initialName, cellReferences, cellFunction);
         main.redefine(
@@ -224,13 +243,15 @@ ${importString}
         main.redefine(cellName, [mutableName], _ => _.generator);
       }
     } else {
-      if (define)
-        main
+      if (define) {
+        tmp_variable_store = main
           .variable(observer(cellName))
           .define(cellName, cellReferences, cellFunction);
-      else main.redefine(cellName, cellReferences, cellFunction);
+        variables.push(tmp_variable_store);
+      } else main.redefine(cellName, cellReferences, cellFunction);
     }
   }
+  return variables;
 };
 const createModuleDefintion = async (
   moduleObject,
@@ -427,7 +448,14 @@ export class Compiler {
     }
     return {
       define(module, observer) {
-        createCellDefinition(cell, module, observer, dependencyMap, true);
+        //return [variables] when creating a cell
+        return createCellDefinition(
+          cell,
+          module,
+          observer,
+          dependencyMap,
+          true
+        );
       },
       redefine(module, observer) {
         createCellDefinition(cell, module, observer, dependencyMap, false);
diff --git a/test/compiler-test.js b/test/compiler-test.js
index 6c14f7a..d3acd27 100644
--- a/test/compiler-test.js
+++ b/test/compiler-test.js
@@ -54,7 +54,9 @@ viewof e = {
   t.equal(await main.value("c"), 12);
 
   const { define: xDefine } = await compile.cell(`x = y - 1`);
-  xDefine(main, () => true);
+  const xDefineVars = xDefine(main, () => true);
+  t.equal(xDefineVars.length, 1); //check length
+  t.equal(xDefineVars[0]._name, "x"); //check name
   await rt._compute();
 
   try {
@@ -65,7 +67,10 @@ viewof e = {
   }
 
   const { define: yDefine } = await compile.cell(`y = 101`);
-  yDefine(main, () => true);
+  const yDefineVars = yDefine(main, () => true);
+  t.equal(yDefineVars.length, 1); //check length
+  t.equal(yDefineVars[0]._name, "y"); //check name
+
   await rt._compute();
 
   t.equal(await main.value("y"), 101);
@@ -86,6 +91,34 @@ viewof e = {
 
   t.equal(await main.value("e"), 20);
 
+  const { define: fDefine } = await compile.cell(`viewof f = {
+    let output = {};
+    let listeners = [];
+    output.value = 20;
+    output.addEventListener = (listener) => listeners.push(listener);;
+    output.removeEventListener = (listener) => {
+      listeners = listeners.filter(l => l !== listener);
+    };
+    return output;
+  }`);
+  const fDefineVars = fDefine(main, () => true);
+  t.equal(fDefineVars.length, 2); //check length
+  t.equal(fDefineVars[0]._name, "viewof f"); //check name
+  t.equal(fDefineVars[1]._name, "f"); //check name
+  await rt._compute();
+
+  t.equal(await main.value("f"), 20);
+
+  const { define: gDefine } = await compile.cell(`mutable g = 123`);
+  const gDefineVars = gDefine(main, () => true);
+  t.equal(gDefineVars.length, 3); //check length
+  t.equal(gDefineVars[0]._name, "initial g"); //check name
+  t.equal(gDefineVars[1]._name, "mutable g"); //check name
+  t.equal(gDefineVars[2]._name, "g"); //check name
+  await rt._compute();
+
+  t.equal(await main.value("g"), 123);
+
   rt.dispose();
   t.end();
 });
diff --git a/test/test_cell.html b/test/test_cell.html
index c3a6d6b..52fdcea 100644
--- a/test/test_cell.html
+++ b/test/test_cell.html
@@ -47,7 +47,11 @@
         window.MODULE = rt.module(define, observer);
 
         compile.cell(`d = 200`).then(({ define: defineCell }) => {
-          defineCell(window.MODULE, observer);
+          const variables = defineCell(window.MODULE, observer);
+          console.log(
+            "Define variable d= 200, created following variables: ",
+            variables
+          );
         });
 
         compile.cell(`a = -300`).then(({ redefine: redefineCell }) => {
@@ -65,11 +69,39 @@
             `import {hello } with {myName as name} from "@tmcw/hello-world"`
           )
           .then(({ define: defineCell }) => {
-            defineCell(window.MODULE, observer);
+            const variables = defineCell(window.MODULE, observer);
+            console.log(
+              'Define import {hello } with {myName as name} from "@tmcw/hello-world", created following variables: ',
+              variables
+            );
 
             compile.cell(`hello`).then(({ define: defineCell }) => {
-              defineCell(window.MODULE, observer);
+              const variables = defineCell(window.MODULE, observer);
+              console.log(
+                "Define hello, created following variables: ",
+                variables
+              );
             });
+
+            compile
+              .cell(`viewof some_viewof = DOM.range()`)
+              .then(({ define: defineCell }) => {
+                const variables = defineCell(window.MODULE, observer);
+                console.log(
+                  "Define viewof some_viewof = DOM.range(), created following variables: ",
+                  variables
+                );
+              });
+
+            compile
+              .cell(`mutable some_mutable = 123`)
+              .then(({ define: defineCell }) => {
+                const variables = defineCell(window.MODULE, observer);
+                console.log(
+                  "Define mutable some_mutable = 123, created following variables: ",
+                  variables
+                );
+              });
           });
       });
   </script>
diff --git a/yarn.lock b/yarn.lock
index 037194a..d56d34e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3,568 +3,564 @@
 
 
 "@observablehq/inspector@^3.2.0":
-  version "3.2.1"
-  resolved "https://registry.yarnpkg.com/@observablehq/inspector/-/inspector-3.2.1.tgz#c953fd95f1b90fac6f39e41965a72cc079d3e465"
-  integrity sha512-U8EASUAUYCQmCprOF9HafRMnU4yyD0IXjRuDwAjBMjVpm36KXPzXWxHcdzlt/3CbIEu8GOhKQqHBAX9pv6OyUQ==
+  "integrity" "sha512-U8EASUAUYCQmCprOF9HafRMnU4yyD0IXjRuDwAjBMjVpm36KXPzXWxHcdzlt/3CbIEu8GOhKQqHBAX9pv6OyUQ=="
+  "resolved" "https://registry.npmjs.org/@observablehq/inspector/-/inspector-3.2.1.tgz"
+  "version" "3.2.1"
   dependencies:
-    esm "^3.2.25"
+    "esm" "^3.2.25"
 
 "@observablehq/parser@^3.0.0":
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/@observablehq/parser/-/parser-3.0.0.tgz#6332909fcff5680d994a581b77cadaba765a0d4a"
-  integrity sha512-BuIfvay+INd2kmUnXNbxYwZ/MnMTYjPEIhns7NuJ9YVIAV+TmxAkZlZdUeCkDpC2XET81BJM8hpOnIzJrqx+1w==
+  "integrity" "sha512-BuIfvay+INd2kmUnXNbxYwZ/MnMTYjPEIhns7NuJ9YVIAV+TmxAkZlZdUeCkDpC2XET81BJM8hpOnIzJrqx+1w=="
+  "resolved" "https://registry.npmjs.org/@observablehq/parser/-/parser-3.0.0.tgz"
+  "version" "3.0.0"
   dependencies:
-    acorn "^7.0.0"
-    acorn-walk "^7.0.0"
+    "acorn" "^7.0.0"
+    "acorn-walk" "^7.0.0"
 
 "@observablehq/runtime@^4.6.4":
-  version "4.6.4"
-  resolved "https://registry.yarnpkg.com/@observablehq/runtime/-/runtime-4.6.4.tgz#d90ded08bd9c10110f76d79eb1c4e12ea7fb974d"
-  integrity sha512-aPiADs8aQfa2ktlZh25ElvRhEZ1WBQ0S/rSfc+aEHCyrtvk+lJ9OMo+FCa01IK4doi6Vkp3xJd2RakbJ6o1hEg==
+  "integrity" "sha512-aPiADs8aQfa2ktlZh25ElvRhEZ1WBQ0S/rSfc+aEHCyrtvk+lJ9OMo+FCa01IK4doi6Vkp3xJd2RakbJ6o1hEg=="
+  "resolved" "https://registry.npmjs.org/@observablehq/runtime/-/runtime-4.6.4.tgz"
+  "version" "4.6.4"
   dependencies:
     "@observablehq/inspector" "^3.2.0"
     "@observablehq/stdlib" "^3.2.0"
-    esm "^3.0.84"
+    "esm" "^3.0.84"
 
 "@observablehq/stdlib@^3.2.0":
-  version "3.2.1"
-  resolved "https://registry.yarnpkg.com/@observablehq/stdlib/-/stdlib-3.2.1.tgz#770a5c2a85d4cb281267a07c6a1e8732ec71b374"
-  integrity sha512-Zsk6C2zccu+71alrv1hyrEfeSaesQ+27KHoDvuuPEdNH9XVC17sHo4HVsBZAroIMBsBjiuFUzuSuiqvD72WX1A==
+  "integrity" "sha512-Zsk6C2zccu+71alrv1hyrEfeSaesQ+27KHoDvuuPEdNH9XVC17sHo4HVsBZAroIMBsBjiuFUzuSuiqvD72WX1A=="
+  "resolved" "https://registry.npmjs.org/@observablehq/stdlib/-/stdlib-3.2.1.tgz"
+  "version" "3.2.1"
   dependencies:
-    d3-require "^1.2.4"
-    marked "https://github.com/observablehq/marked.git#94c6b946f462fd25db4465d71a6859183f86c57f"
+    "d3-require" "^1.2.4"
+    "marked" "git+https://github.com/observablehq/marked.git#94c6b946f462fd25db4465d71a6859183f86c57f"
 
 "@types/estree@*", "@types/estree@0.0.39":
-  version "0.0.39"
-  resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.39.tgz#e177e699ee1b8c22d23174caaa7422644389509f"
-  integrity sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==
+  "integrity" "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw=="
+  "resolved" "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz"
+  "version" "0.0.39"
 
 "@types/node@*":
-  version "12.7.5"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.7.5.tgz#e19436e7f8e9b4601005d73673b6dc4784ffcc2f"
-  integrity sha512-9fq4jZVhPNW8r+UYKnxF1e2HkDWOWKM5bC2/7c9wPV835I0aOrVbS/Hw/pWPk2uKrNXQqg9Z959Kz+IYDd5p3w==
+  "integrity" "sha512-9fq4jZVhPNW8r+UYKnxF1e2HkDWOWKM5bC2/7c9wPV835I0aOrVbS/Hw/pWPk2uKrNXQqg9Z959Kz+IYDd5p3w=="
+  "resolved" "https://registry.npmjs.org/@types/node/-/node-12.7.5.tgz"
+  "version" "12.7.5"
 
 "@types/resolve@0.0.8":
-  version "0.0.8"
-  resolved "https://registry.yarnpkg.com/@types/resolve/-/resolve-0.0.8.tgz#f26074d238e02659e323ce1a13d041eee280e194"
-  integrity sha512-auApPaJf3NPfe18hSoJkp8EbZzer2ISk7o8mCC3M9he/a04+gbMF97NkpD2S8riMGvm4BMRI59/SZQSaLTKpsQ==
+  "integrity" "sha512-auApPaJf3NPfe18hSoJkp8EbZzer2ISk7o8mCC3M9he/a04+gbMF97NkpD2S8riMGvm4BMRI59/SZQSaLTKpsQ=="
+  "resolved" "https://registry.npmjs.org/@types/resolve/-/resolve-0.0.8.tgz"
+  "version" "0.0.8"
   dependencies:
     "@types/node" "*"
 
-acorn-walk@^7.0.0:
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-7.0.0.tgz#c8ba6f0f1aac4b0a9e32d1f0af12be769528f36b"
-  integrity sha512-7Bv1We7ZGuU79zZbb6rRqcpxo3OY+zrdtloZWoyD8fmGX+FeXRjE+iuGkZjSXLVovLzrsvMGMy0EkwA0E0umxg==
-
-acorn@^7.0.0:
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.0.0.tgz#26b8d1cd9a9b700350b71c0905546f64d1284e7a"
-  integrity sha512-PaF/MduxijYYt7unVGRuds1vBC9bFxbNf+VWqhOClfdgy7RlVkQqt610ig1/yxTgsDIfW1cWDel5EBbOy3jdtQ==
-
-acorn@^7.1.0:
-  version "7.1.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.1.0.tgz#949d36f2c292535da602283586c2477c57eb2d6c"
-  integrity sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==
-
-async@^1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
-  integrity sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=
-
-balanced-match@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
-  integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
-
-brace-expansion@^1.1.7:
-  version "1.1.11"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
-  integrity sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==
-  dependencies:
-    balanced-match "^1.0.0"
-    concat-map "0.0.1"
-
-builtin-modules@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-3.1.0.tgz#aad97c15131eb76b65b50ef208e7584cd76a7484"
-  integrity sha512-k0KL0aWZuBt2lrxrcASWDfwOLMnodeQjodT/1SxEQAXsHANgo6ZC/VEaSEHCXt7aSTZ4/4H5LKa+tBXmW7Vtvw==
-
-colors@1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/colors/-/colors-1.0.3.tgz#0433f44d809680fdeb60ed260f1b0c262e82a40b"
-  integrity sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=
-
-concat-map@0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
-  integrity sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=
-
-corser@~2.0.0:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/corser/-/corser-2.0.1.tgz#8eda252ecaab5840dcd975ceb90d9370c819ff87"
-  integrity sha1-jtolLsqrWEDc2XXOuQ2TcMgZ/4c=
-
-d3-require@^1.2.4:
-  version "1.2.4"
-  resolved "https://registry.yarnpkg.com/d3-require/-/d3-require-1.2.4.tgz#59afc591d5089f99fecd8c45ef7539e1fee112b3"
-  integrity sha512-8UseEGCkBkBxIMouLMPONUBmU8DUPC1q12LARV1Lk/2Jwa32SVgmRfX8GdIeR06ZP+CG85YD3N13K2s14qCNyA==
-
-debug@^2.2.0:
-  version "2.6.9"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
-  integrity sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==
-  dependencies:
-    ms "2.0.0"
-
-debug@^3.0.0:
-  version "3.2.6"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
-  integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
-  dependencies:
-    ms "^2.1.1"
-
-deep-equal@~1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/deep-equal/-/deep-equal-1.0.1.tgz#f5d260292b660e084eff4cdbc9f08ad3247448b5"
-  integrity sha1-9dJgKStmDghO/0zbyfCK0yR0SLU=
-
-define-properties@^1.1.2, define-properties@^1.1.3:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/define-properties/-/define-properties-1.1.3.tgz#cf88da6cbee26fe6db7094f61d870cbd84cee9f1"
-  integrity sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==
-  dependencies:
-    object-keys "^1.0.12"
-
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