0 0 /ˈziːroʊ/

adjective

1. () Indicating the absence of any or all units under consideration  ( 0 , zero )
   indicating the absence of any or all units under consideration
    A zero score
   a zero score
   

noun

1. () A mathematical element that when added to another number yields the same number  ( cipher , cypher , nought [British] , zero , 0 )
   a mathematical element that when added to another number yields the same number
    The temperature outside is zero degrees Celsius
   The temperature outside is zero degrees Celsius