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(zēr′ō)

[It zero, ult. fr. Arabic sifr, empty, zero, cipher]
ABBR: z SYMB: 0
1. A number that is neither positive nor negative; a number that has no value; nothing.
2. The point from which the graduation figures of a scale commence.
On the Celsius scale, e.g., zero (0°) is the temperature of melting ice.
SEE: thermometer

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