1 : during the time before something happens or before a specified period ends The new computers won't arrive until next week, but we can keep using the old ones in the meantime.

Is it meantime or in the meantime?

What does meantime mean? Meantime means the period of time between two events—between the current time and the time when something else happens. This sense of the word is especially used in the phrase in the meantime, as in The power will come back on soon, so let's just enjoy the quiet in the meantime.

Is it correct to say in the meantime?

Meanwhile and meantime can both be nouns or adverbs and are interchangeable. "Meantime" is more frequently seen as a noun, in the phrases "in the meantime" and "for the meantime." "Meanwhile" is usually seen as an adverb, such as in "meanwhile, back at the farm."