zero

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zero absolute zero physiological zero

Main Entry: ze·ro
Pronunciation: z-()r, zi()r-()
Function: noun
Inflected Form(s): plural zeros also zeroes
1 : the arithmetical symbol 0 or Ø denoting the absence of all magnitude or quantity
2 a : the point of departure in reckoning; specifically : the point from which the graduation of a scale (as of a thermometer) begins b : the temperature represented by the zero mark on a thermometer