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X factor

American

[eks fak-ter] / ˈɛks ˌfæk tər /

noun

an essential quality or feature that is difficult to identify or express.

Other Word Forms

Noun Inflected Forms

X factors

plural

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.