9 letters · 17 points in Scrabble
noun the time between one event, process, or period and another
adverb at the same time but in another place
adverb during the intervening time
originFrom Middle English menewhile, equivalent to mean (“intermediate”) + while. Adverb is by ellipsis from in the mean while, noun being conventionally written as one word after the adjective.
Etymology from Wiktionary, CC BY-SA 3.0