Definition of opener noun from the Oxford Advanced American Dictionary

     

    opener

     noun
    noun
    NAmE//ˈoʊpənər//
     
     
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  1. 1 (usually in compounds) a tool that is used to open things a can opener a bottle opener see also eye-opener
  2. 2 the first in a series of things such as sports games; the first action in an event, a game, etc. They won the season opener 4–2. Jones scored the opener. a good conversation opener
  3. Idioms
    for openers(informal)
     
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    as a beginning or first part of a process For openers, the band played a track from their new album.
See the Oxford Advanced Learner's Dictionary entry: opener