Google Releases Glossary Search Command
Google has introduced a new advanced search command that is designed to enable users to find the most current definitions to word(s) and phrases. Users can type the word "define," then a space, and the word or phrase they want defined into the Google.com search field. If Google has seen a definition for the word or phrase on the Web, it will retrieve that information and display it at the top of the search results page.
define www ----->gives single definition for "www"
define:www ----->gives a list of definitions for "www"
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