WordNet (r) 3.0 (2006):

fait accompli
    n 1: an irreversible accomplishment [syn: fait accompli,
         accomplished fact]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "fait accompli":
   accomplished fact, accomplishment, achievement, act, acta, action,
   actuality, adventure, attainment, authenticity, blow, carrying out,
   consummation, coup, dealings, deed, discharge, dispatch, doing,
   doings, effectuation, effort, endeavor, enterprise, execution,
   exploit, factuality, feat, fruition, fulfillment, gest, go,
   grim reality, hand, handiwork, historicity, implementation, job,
   maneuver, measure, mission accomplished, move, not a dream,
   objective existence, operation, overt act, passage, performance,
   proceeding, production, reality, realization, res gestae, step,
   stroke, stunt, success, thing, thing done, tour de force,
   transaction, truth, turn, undertaking, work, works