Definition of zero number from the Oxford Advanced American Dictionary

      

    zero

     number
    number
    NAmE//ˈzɪroʊ//
     
    , NAmE//ˈziroʊ//
     
     
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  1. 1 (pl. zeros) 0 Five, four, three, two, one, zero… We have liftoff.
  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. 3the lowest possible amount or level; nothing at all I rated my chances as zero. zero inflation
See the Oxford Advanced Learner's Dictionary entry: zero