Definition of meantime adverb from the Oxford Advanced Learner's Dictionary

 

meantime

 adverb
adverb
BrE BrE//ˈmiːntaɪm//
 
; NAmE NAmE//ˈmiːntaɪm//
 
 
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(informal) = meanwhile I'll contact them soon. Meantime don't tell them I'm back. Word Origin Middle English (as a noun): from mean(noun) + time.
See the Oxford Advanced American Dictionary entry: meantime