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absolute temperature temperature measured on a scale in which zero equals the lowest temperature that can be obtained physically.
absolute value the magnitude of a real number irrespective of its sign; distance of a real number from zero. [1/2 definitions]
Arabic numeral any of the symbols for the numbers one through nine, including zero; 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9.
Arcturus an orange star in the constellation Bo÷tes, having a magnitude of zero.
C1 abbreviation of "Celsius," or "Centigrade," of, pertaining to, or designating a temperature scale on which zero degrees is the freezing point and one hundred degrees is the boiling point of water.
Celsius of, pertaining to, or designating a temperature scale on which zero degrees is the freezing point and one hundred degrees is the boiling point of water; centigrade. (abbr.: C)
cipher the sign 0; naught or zero. [1/7 definitions]
countdown the act or procedure of counting in reverse in preparation for some event, such as the firing of a rocket, to occur at "zero". [1/2 definitions]
deflection in physics, the movement away from zero of the indicator of a measuring instrument. [1/3 definitions]
digit any of the numbers from zero through nine. [1/2 definitions]
integer a positive or negative whole number or zero; a whole number as opposed to a fraction.
Kelvin a thermodynamic temperature scale whose degree intervals correspond to those of the Celsius scale and in which zero degrees, or absolute zero, is equal to -273.15 degrees Celsius. [1/3 definitions]
naught the number zero. [1/3 definitions]
negative indicating a number or quantity less than zero. (Cf. positive.) [2/14 definitions]
nil nothing; zero.
nonzero indicating a quantity or value other than zero.
nothing zero. [1/7 definitions]
o the cipher zero. [1/4 definitions]
one the number that follows zero and precedes two in the sequence of cardinal numbers. [1/11 definitions]
pH a symbol for a measure of the degree of alkalinity or acidity of a solution, determined by the concentration or activity of hydrogen ions therein (often fol. by a number, with seven indicating neutrality, zero to six indicating acidity, and eight to fourteen indicating alkalinity).
photon the fundamental unit of electromagnetic energy with zero mass, no electrical charge, and a spin of one, usu. regarded as an elementary particle.