Get the definition/synonym of any word in a webpage.

Define promo image
What is Define?

Define is a Chrome extension by lerxst. This extension has 1,000 weekly active users, an average user rating of 3.88, and was removed from Chrome Web Store 7 months ago. The latest version, 2.0.1, was updated 9 years ago.

This extension was removed from Chrome Web Store on 2022-06-17
Stats date:
By: lerxst
Users: 1,000
Rating: 3.88 (32)
Version: 2.0.1 (Last updated: 2013-12-28)
Creation date: 2013-12-28
Manifest version: 2
  • contextMenus
  • tabs
Featured: No
Size: 253.95K
Email: Click to see
Risk impact: High risk impact
Risk likelihood: High risk likelihood
Found a bug?

Other platforms

Not available on Firefox
Not available on Edge
**Google dictionary error fixed**

• Select any word on a webpage and see its definition or its synonym by using the context-menu option.
The definition can also be viewed using the key combination 'Ctrl+m' after selecting a word.

•You can also type in the word you want to look-up by using Chrome's omnibox.

**Using the OMNIBOX**
To use Chrome's address bar for a quick search, type 'df' (without quotes) and press 'Tab' to get the prompt. Type in the search word and press enter. 
To look the word up in a thesaurus, append the search word with '\t' (without quotes).

Choose from 5 online dictionaries -
• Google
• Merriam-Webster
See more
Risk impact

Define requires a number of risky permissions that can potentially harm your browser and steal your data. Exercise caution when installing this extension. Review carefully before installing. We recommend that you only install Define if you trust the publisher.

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypass your security settings, and access your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Risk likelihood

Define may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

Risk likelihood measures the probability that a Chrome extension may turn malicious. This is determined by the publisher and the Chrome extension reputation on Chrome Web Store, the amount of time the Chrome extension has been around, and other signals about the Chrome extension. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Chrome extension, especially ones with higher risk impact and/or higher risk likelihood.

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User reviews
i love my copumter because it helps me find what i need to find out
by teresa ramirez, 2019-04-25

this is the best tool for to find define and synonyms words easy way. Thanks
by Adam Nguyen Adam Nguyen, 2018-07-03

this is the best tool for to find define and synonyms words easy way. Thanks
by Nguyen xuan Tinh Nguyen xuan Tinh, 2018-07-03
View all user reviews
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Add extra meaning to your web browsing. Look up for definitions while you are on web.

The manifest file declares the requirements and permissions that a Chrome extension will have access to. By reviewing the manifest, you may be able to determine if a Chrome extension is over-reaching (for example, if an extension is overriding your new tab page, or search provider, or requesting access to your web activities without any good reason).

  "update_url": "",
  "manifest_version": 2,
  "name": "Define",
  "version": "2.0.1",
  "options_page": "options.html",
  "description": "Get the definition/synonym of any word in a webpage.",
  "background": {
    "scripts": [
    "persistent": true
  "omnibox": {
    "keyword": "df"