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English definition of “since”

since

adverb [not gradable]  /sɪns/ us  

since adverb [not gradable] (TIME)

from a particular time 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 working ever since (= from then until now).
Idioms

since

preposition  /sɪns/ us  

since preposition (TIME)

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

since

conjunction  /sɪns/ us  

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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