Factum \Fac"tum\, n.; pl. Facta. [L. See Fact.]

1. (Law) A man's own act and deed; particularly:
   (a) (Civil Law) Anything stated and made certain.
   (b) (Testamentary Law) The due execution of a will, including everything necessary to its validity.

2. (Mach.) The product. See Facient, 2.

Source: Webster's Revised Unabridged Dictionary (1913)