temporary, impermanent, lag, transitionary, intermediary, between-step, interterm, transient, intersessionary, intersession, more...

permanent, enduring, lasting, perpetual, fixed

interregnum, interim agreement, interim government, interim report, interim dividend, interim budget, more...

brief, long, year, short, general, month, week, only, par, sad, day

transition period,   provide pro tem,   transitional period,   temporary leader,   between time,   short time title,   stand in leader,   acting manager,   temporary period,   temporary stage