1.(Arith.) A cipher; nothing; naught.
2.The point from which the graduation of a scale, as of a thermometer, commences. Note: Zero in the Centigrade, or Celsius thermometer, and in the Réaumur thermometer, is at the point at which water congeals. The zero of the Fahrenheit thermometer is fixed at the point at which the mercury stands when immersed in a mixture of snow and common salt. In Wedgwood's pyrometer, the zero corresponds with 1077° on the Fahrenheit scale.
3.Fig.: The lowest point; the point of exhaustion; as, his patience had nearly reached zero.
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