since Meaning, definition in Cambridge English Dictionary
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Meaning of "since" - English Dictionary

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sinceadverb

uk   us   /sɪns/
B2 from a particular time in the past until a later time, or until now: Emma went to work in New York a year ago, and we haven't seen her since. He started working for the company when he left school, and has been there ever since (= and is still there). I've long since (= long ago) forgotten any Latin I ever learned.
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sincepreposition

uk   us   /sɪns/

sinceconjunction

uk   us   /sɪns/

since conjunction (BECAUSE)

B1 because; as: Since we've got a few minutes to wait for the train, let's have a cup of coffee.
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since conjunction (TIME)

B1 from a particular time in the past until a later time, or until now: I've been very busy since I came back from holiday.
Grammar
(Definition of since from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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