Definition of zero number from the Oxford Advanced Learner's Dictionary

      

    zero

     number
    number
    BrE BrE//ˈzɪərəʊ//
     
    ; NAmE NAmE//ˈzɪroʊ//
     
    , NAmE//ˈziːroʊ//
     
     
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  1. 1  (pl. zeros) (British English also nought) 0 Five, four, three, two, one, zero… We have lift-off.
  2. 2  a temperature, pressure, etc. that is equal to zero on a scale It was ten degrees below zero last night (= −10°C). The thermometer had fallen to zero.
  3. 3  the lowest possible amount or level; nothing at all I rated my chances as zero. zero inflation
  4. Word Origin early 17th cent.: from French zéro or Italian zero, via Old Spanish from Arabic ṣifr ‘cipher’.
See the Oxford Advanced American Dictionary entry: zero