| Retroactive (a.) Reverting to a past condition or action; as a retroactive interest charge; affecting what is past; retrospective. Thesaurus Entries a priori, antiphonal, back, backward, early, ex post facto, into the past, reacting, reactionary, reactive, recessive, reflex, reflexive, refluent, regressive, respondent, responding, responsive, retroactionary, retrocessive, retrograde, retrogressive, retrospective, revulsive |