extempore
adv.
1550s, from Latin phrase ex tempore "offhand, in accordance with (the needs of) the moment," literally "out of time," from ex "out of" (see ex-) + tempore, ablative of tempus (genitive temporis) "time" (see temporal). Of speaking, strictly "without preparation, without time to prepare," but now often with a sense merely of "without notes or a teleprompter." As an adjective and noun from 1630s.
〔李〕[ex-;tempor;-e] a.临时作成的； 即席的 ←tempor (L tempus,temporis)=section of time 时间
〔蒋〕[ex-外，tempor时，时间;’在规定时间之外的”→不在计划时间之内的] 临时的，即席的，当场的，无准备的