Definition of factum:
(n) :
(law) Somebody's own act and deed.
(n) :
(law, civil law) Anything stated and made certain.
(n) :
(law) The due execution of a will, including everything necessary to its validity.
(n) :
(law, Canada) A statement of fact and law delivered before a court.
(n) :
(mathematics, obsolete) A product (result of multiplying two numbers).