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since

Pronunciation: /sɪns/

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Definition of since

preposition , conjunction , & adverb

  • 1in the intervening period between (the time mentioned) and the time under consideration, typically the present: [as preposition]:she has suffered from depression since she was sixteen the worst property slump since the war I’ve felt better since I’ve been here [as adverb]:she ran away on Friday and we haven’t seen her since
  • 2 [conjunction] for the reason that; because:delegates were delighted, since better protection of rhino reserves will help protect other rare species
  • 3 [adverb] ago:the settlement had vanished long since

Origin:

late Middle English: contraction of obsolete sithence, or from dialect sin (both from dialect sithen 'thereupon, afterwards, ever since')

Grammar

ConjunctionA subordinating conjunction used to introduce two types of adverbial clause: time:Since we moved here the asthma has got worse. reason:The Germans thought Danzig might be bombed but not Gdynia, since the latter is a Polish city. PrepositionIt is also used as a preposition:I haven’t seen her since Monday.

since in other Oxford dictionaries

Definition of since in the US English dictionary