Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.
A unique and noteworthy quality that makes someone or something exceptional. There are a lot of really talented singers in this contest, but I think Molly's X factor is her stage presence. A lot of similar products are on the market right now—ours has to have an X factor!
See also: factor
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.