Entry 2 senses · 2 variants Webster, 1913 Meantime /mēnʹtīm/ · Mean·time · IPA /ˈmiːntaɪm/ n. adv. 01 n. The intervening time; as, in the meantime (or mean time). 1. The intervening time; as, in the meantime (or mean time). 02 adv. In the intervening time; during the interval. 1. In the intervening time; during the interval.