A2 [C or U] (the number) 0; nothing: Five, four, three, two, one, zero. The number one million is written with a one and six zeros. Heavy rain has reduced visibility almost to zero (= its lowest point).Cardinal numbers, including nought and zero B1 [U] on a set of numbers for comparing temperature in degrees Celsius, the level of temperature at which water freezes: The temperature is expected to drop to ten degrees below zero tonight.ColdSnow and iceMeasurements of temperature

(Definition of zero number from the Cambridge Advanced Learner's Dictionary & Thesaurus
© Cambridge University Press)

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