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English definition of “someday”

someday

adverb     /ˈsʌm.deɪ/
at some time in the future that is not yet known or not stated : Maybe someday you'll both meet again. Someday soon you're going to have to make a decision .In the future and soon
(Definition of someday adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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