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www.merriam-webster.com/dictionary/X%20factor

Define X factor: a circumstance, quality, or person that has a strong but unpredictable influence.

www.urbandictionary.com/define.php?term=X%20-%20Factor

Top Definition. X - Factor. an indescribable quality or something; something about a person that you cannot put your finger on; je ne sais quoi. I don't know what ...

dictionary.cambridge.org/dictionary/english/the-x-factor

the X factor meaning, definition, what is the X factor: a quality that you cannot describe that makes someone very special: . Learn more.

www.dictionary.com/browse/x--factor

X factor definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it up now!

en.oxforddictionaries.com/definition/x_factor

Definition of X factor - a noteworthy special talent or quality, a variable in a given situation that could have the most significant impact on the outcome.

www.collinsdictionary.com/us/dictionary/english/x-factor

X factor definition: an unknown or unexplained element that makes something more interesting or valuable | Meaning, pronunciation, translations and examples .

www.oxfordlearnersdictionaries.com/us/definition/english/x-factor

Definition of x-factor noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and ...

en.wiktionary.org/wiki/X_factor

English[edit]. Alternative forms[edit]. x-factor · x factor. Noun[edit]. X factor (plural X factors). (idiomatic) An unknown or hard-to-define influence; a factor with ...

www.medicinenet.com/script/main/art.asp?articlekey=18593

Medical Definition of X, factor. X, factor: A coagulation factor, a substance in blood essential to the normal clotting process. Production of factor X takes place in ...