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Noun: X factor
  1. (informal) an unknown or hard-to-define but important special property
    "When we are hiring MBAs we really do look for an X factor"
    - x-factor

Encyclopedia: X factor

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Wytensin
wyvern
X
x
X chromosome
X factor
X ray
Xanadu
Xanax
xanthate
xanthelasma
xanthemia
xanthene
xanthic acid
xanthine
Xanthium