since Meaning in the Cambridge English Dictionary
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Meaning of “since” in the English Dictionary

"since" in British English

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sinceadverb

uk   us   /sɪns/
B2 from a ​particulartime in the past until a ​latertime, or until now: Emma went to ​work in New York a ​year ago, and we haven't ​seen her since. He ​startedworking for the ​company in 1995, and has been there ever since (= and is still there). I've long since (= ​long ago)forgotten any ​Latin I ​everlearned.
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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 ​particulartime in the past until a ​latertime, or until now: I've been very ​busy since I came back from ​holiday.
Grammar
(Definition of since from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"since" in American English

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sinceadverb [not gradable]

 us   /sɪns/

since adverb [not gradable] (TIME)

from a ​particulartime in the past until now: Alfredo ​left the ​house at six this ​morning, and we haven’t ​seen him since. I got my first ​job in 1973 and I’ve been ​workingever since (= from then until now).
Idioms

sincepreposition

 us   /sɪns/

since preposition (TIME)

in the ​time after a ​particulartime in the past: A lot has ​happened since 1980.

sinceconjunction

 us   /sɪns/

since conjunction (BECAUSE)

because; as: Since you’ve ​asked, I’ll ​tell you what I really ​think.

since conjunction (TIME)

from the ​time in the past when: It’s been more than two ​years since we moved back to New York.
(Definition of since from the Cambridge Academic Content Dictionary © Cambridge University Press)
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