mean time

(noun) (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator). Synonyms: mean time, mean solar time.

(noun) the time between one event, process, or period and another. Synonyms: interim, meantime, meanwhile, lag. Example: "Meanwhile the socialists are running the government."

(adv) during the intervening time. Synonyms: meanwhile, meantime, in the meantime. Examples: "Meanwhile i will not think about the problem." "Meantime he was attentive to his other interests." "In the meantime the police were notified."