The English Dictionary Chrome Extension offers a convenient way to look up the meaning of words with a simple double-click. Once installed, users can double-click on any word on a web page to instantly view its definition. The extension provides information on different parts of speech and various meanings for the selected word, enhancing the user's understanding of the language.

Moreover, users have the option to select words or phrases by dragging the mouse, in case double-clicking is not feasible, such as with URLs. This feature can be activated through the Dictionary extension icon, providing flexibility in word lookup methods.