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metatag

noun Computers.
  1. a tag in HTML that is inserted at the top of a web page chiefly to describe its content and provide keywords for use by search engines.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for meta tag

meta tag

metatag

noun
  1. an element of HTML that describes the contents of a Web page, and is placed near the beginning of the page's source code, and used by search engines to index pages by subject
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

meta tag in Science

metatag

[mĕtə-tăg′]
  1. An HTML tag that contains descriptive information about a webpage and does not appear when the webpage is displayed in a browser. A word that is in a metatag of a webpage will cause that webpage to turn up as a result of a search engine's search on that word, even if that word is not found in the webpage as viewed in a browser.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.