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denominator

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Denominator \De*nom"i*na'tor\, noun [Cf. F. d['e]nominateur.]

1. One who, or that which, gives a name; origin or source of a name.

This opinion that Aram . . . was the father and denomination of the Syrians in general. --Sir W. Raleigh.

2. (Arith.) That number placed below the line in common fractions which shows into how many parts the integer or unit is divided.

Note: Thus, in 3/5, 5 is the denominator, showing that the integer is divided into five parts; and the numerator, 3, shows how many parts are taken.

Note: In this sense, the denominator is not necessarily a number, but may be any expression, either positive or negative, real or imaginary. --Davies & Peck (Math. Dict.)

{common denominator} a number which can divide either of two or more other numbers without leaving a remainder in any of the divisions; as, 2 and 4 are common denominators of 12 and 28..

{greatest common denominator} the largest {common denominator} of two or more numbers; as, 9 is the greatest common denominator of 18 and 27.. [PJC]

From WordNet (r) 3.0 (2006) [wn]:

noun

1: the divisor of a fraction