Definition of spare noun from the Oxford Advanced Learner's Dictionary

      

    spare

     noun
    noun
    BrE BrE//speə(r)//
     
    ; NAmE NAmE//sper//
     
     
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  1. 1  an extra thing that you keep in case you need to replace the one you usually use (used especially about a tyre of a car) to get the spare out of the boot/trunk I've lost my key and I haven't got a spare.
  2. 2spares [plural] (especially British English) = spare part It can be difficult to get spares for some older makes of car.
  3. Word Origin Old English spær ‘not plentiful, meagre’, sparian ‘refrain from injuring’, ‘refrain from using’, of Germanic origin; related to Dutch and German sparen ‘to spare’.
See the Oxford Advanced American Dictionary entry: spare