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Definition of X factor noun from the Oxford Advanced Learner's Dictionary

X factor

noun
x factor pronunciation English ˈeks fæktə(r) x factor pronunciation American ˈeks fæktər
[singular]
 
a special quality, especially one that is essential for success and is difficult to describe
She certainly has the X factor that all great singers have.The effect of the weather on production costs is always something of an X factor, or unknown variable.