key word

[kee-wurd]

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. 2012.
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Key word is always a great word to know.
So is interrobang. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
WordNet
key word

noun
1. a word that is used as a pattern to decode an encrypted message 
2. a significant word used in indexing or cataloging 
WordNet® 3.0, © 2006 by Princeton University.
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