prolepsis

noun pl. -·ses′-sēz′

an anticipating; esp., the describing of an event as taking place before it could have done so, the treating of a future event as if it had already happened, or the anticipating and answering of an argument before one's opponent has a chance to advance it

Etymology: L < Gr prolēpsis, an anticipating < prolambanein, to take before < pro-, before + lambanein, to take: see lemma