Does it matter which you use? 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."

How do you use meanwhile?

1 : at or during the same time : while something else is being done or was being done You can set the table. In the meanwhile, I'll start making dinner. She spent four years studying for her law degree. In the meanwhile, she continued to work at the bank.

What is mean while?

: the time before something happens or before a specified period ends : meantime in the meanwhile colleges and universities have become somewhere near one hundred times more complex— Dennis O'Brien. meanwhile. adverb.