English

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

      

    since

     preposition
    preposition
    BrE BrE//sɪns//
     
    ; NAmE NAmE//sɪns//
     
     
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  1. 1  (used with the present perfect or past perfect tense) from a time in the past until a later past time, or until now She's been off work since Tuesday. We've lived here since 2006. I haven't eaten since breakfast. He's been working in a bank since leaving school. Since the party she had only spoken to him once. ‘They've split up.’ ‘Since when? That was years ago. I've changed jobs since then. Use for, not since, with a period of time:I've been learning English for five years.I’ve been learning English since five years.
  2. 2since when? used when you are showing that you are angry about something Since when did he ever listen to me?
  3. Word Origin late 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