Definitions for X factor
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Wiktionary
X factor(Noun)
An unknown or hard-to-define influence; a factor with unknown or unforeseeable consequences.
X factor(Noun)
prothrombinase, also called factor X.
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"X factor." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/X factor>.

