Meanwhile
来自Big Physics
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late Middle English: from mean3 + while.
wiktionary
From Middle English menewhile, equivalent to mean + while. Adverb is by ellipsis from in the mean while, noun being conventionally written as one word after the adverb.
etymonline
meanwhile (n.)
also mean while, late 14c., "mean time, the interval between one specified period and another," from mean (adj.2) "middle, intermediate" + while (n.). From late 14c. as an adverb, "during or in a certain period of time." Properly two words as a noun but commonly written as one, after the adverb.
