XFACTORY

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What is the meaning of X Factor?

X-Factor in very general term means the unknown factor

or the unexplainable thing which adds a certain value to that object, element or a person.

In relation to a person it is defined as the unexplainable element of a person's attractiveness or sexiness.

This is more of a slang and is not a part of the English Language (as in being accepted into the Dictionary) yet.