key·word

[kee-wurd]
noun
1.
a word that serves as a key, as to the meaning of another word, a sentence, passage, or the like: Search the database for the keyword “Ireland.”
2.
a word used to encipher or decipher a cryptogram, as a pattern for a transposition procedure or the basis for a complex substitution.
3.
Also called catchword. Library Science. a significant or memorable word or term in the title, abstract, or text of an item being indexed, used as the index entry.
Also, key word.


Origin:
1855–60; key1 + word

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
keyword (ˈkiːˌwɜːd) [Click for IPA pronunciation guide]
 
n
1.  a word used as a key to a code
2.  any significant word or phrase, esp a word used to describe the contents of a document

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Keyword is always a great word to know.
So is lollapalooza. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
FOLDOC
Computing Dictionary

keyword definition


1. One of a fixed set of symbols built into the syntax of a language. Typical keywords would be if, then, else, print, goto, while, switch. There are usually restrictions about reusing keywords as names for user-defined objects such as variables or procedures. Languages vary as to what is provided as a keyword and what is a library routine, for example some languages provide keywords for input/output operations whereas in others these are library routines.
2. A small set of words designed to convey the subject of a technical article. Some publications specify a fixed set of keywords from which those for a particular article should be chosen.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Once it spotted such a keyword, it would make its move.
Keyword searching is one way to find what you are looking for.
To search for jobs, enter a keyword and/or select a category.
But there's no way to have a standing keyword search.
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