Definition of since conjunction from the Oxford Advanced Learner's Dictionary



    BrE BrE//sɪns//
    ; NAmE NAmE//sɪns//
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  1. 1  (used with the present perfect, past perfect or simple present tense in the main clause) from an event in the past until a later past event, or until now Cath hasn't phoned since she went to Berlin. It was the first time I'd had visitors since I'd moved to London. It's twenty years since I've seen her. How long is it since we last went to the theatre? She had been worrying ever since the letter arrived.
  2. 2  because; as We thought that, since we were in the area, we'd stop by and see them.
  3. Word Originlate Middle English: contraction of obsolete sithence, or from dialect sin (both from dialect sithen ‘thereupon, afterwards, ever since’).
See the Oxford Advanced American Dictionary entry: since