Meanwhile means while that other thing was going on. She was stuck on the motorway with a flat tyre; meanwhile, the guests were arriving and the oven was still cold.
It also swings the camera. 'Ticket prices keep rising. Meanwhile, the trains get slower' uses meanwhile to jump to another group or another side of the story, and the overlap in time barely matters. It sits at the front of the sentence with a comma after it. In the meantime is the near twin, and it is the one to reach for when somebody is waiting: the plumber comes on Thursday; in the meantime, use the downstairs tap. The mistake to avoid is treating meanwhile as a joining word — 'Meanwhile I was cooking, he slept' is wrong, and that sentence wants while instead.
1adverbmeanwhileDuring the same period of time; while something else is happening.~2%
“He unpacked the shopping; meanwhile the dog worked its way through the bread.”
synonyms: in the meantime, at the same time
2adverbturnUsed to turn to another subject, place or group, often to point up a contrast.~98%
“The city has three new theatres. Meanwhile, the library has been shut for two years.”
Shares are an estimate: a language model read 7 sentences found in the wild and placed 7 of them on a sense — a count of our sample, not a measurement of English.
Meanwhile comes from Middle English menewhile, simply mean plus while. The adverb is a shortening of the older phrase in the mean while, which is why in the meantime still sounds so familiar: it is the same phrase with a different second half.
Middle English
menewhile
English, today
meanwhile
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 adjective.
Etymology from Wiktionary, CC BY-SA