- noun a unit of measurement on a scale of temperature where the freezing and boiling points of water are 0 and 100 respectively
- Its symbol is °C. A unit of temperature interval used in the Celsius scale. This scale is based on the freezing and boiling points of water under certain conditions, assigning values of 0 °C and 100 °C respectively. An increment of 1 degree Celsius equals an increment of 1 kelvin. Formerly called degree centigrade.
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