fac·tum \ˈfaktəm\noun (pluralfac·ta \-tə\ ; alsofactums) Etymology: New Latin, from Latin, act, deed — more at fact 1.law: a man's own act and deed: as a.: an instrument under seal b.: the due execution of a will 2.[Late Latin, from Latin] a.: fact, event b.: a statement of facts (as of a case in court) : memorial