no quantity or number; nought; the figure 0:figures from zero to nineyou’ve left off a zero—it should be five hundred million
a point on a scale or instrument from which a positive or negative quantity is reckoned:the gauge dropped to zero [as modifier]:a zero rate of interest
the temperature corresponding to 0° on the Celsius scale (32° Fahrenheit), marking the freezing point of water:the temperature was below zero
[usually as modifier] Linguistics the absence of an actual word or morpheme to realize a syntactic or morphological phenomenon:the zero plural in ‘three sheep’
the lowest possible amount or level; nothing at all:I rated my chances as zero