Meaning of counterfactual

coun•ter•fac•tu•al

Pronunciation: (koun"tur-fak'ch-ul), [key]
— n. Logic.
  1. a conditional statement the first clause of which expresses something contrary to fact, as “If I had known.”
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: