ad interim

1 intended to last, continue, or serve for a limited time <will serve as the ad interim CEO until the merger of the two corporations is complete> Synonyms temporary, impermanent, interim, provisional, provisionary, provisory, short-termRelated Words acting; alternate, proxy, substitute; expedient, improvised, makeshift; intermediary, intermediate, transitional; ephemeral, fleeting, fugitive, short-lived, transitory; conditional, contingent, limited, qualified, short-range, tentative; replaceable, terminable, terminateNear Antonyms final, fixed, set, settled; unconditional, unlimited, unqualified; extended, lasting, long-range, standing; dateless, deathless, endless, enduring, eternal, everlasting, immortal, perpetual, timeless, undying, unendingAntonyms long-term, permanent

2 serving in a position for the time being <an ad interim government until the new constitution goes into effect> Synonyms acting, interim, provisional, provisionary, provisory, temporaryRelated Words alternate, backup, jackleg, make-do, makeshift, proxy, stopgap, substituteAntonyms long-term, permanent