AskDefine | Define denominator

Dictionary Definition

denominator n : the divisor of a fraction

User Contributed Dictionary



  1. The number or expression written below the line in a fraction.

Related terms


The number or expression written below the line in a fraction

Extensive Definition

Denominator is the name for the bottom part of a fraction. It tells you how many equal parts make up a whole, and is also used in the name of the fraction: "halves", "thirds", "quarters", "fifths", "sixths" and so on. The reduced fraction for a rational must have an integer denominator.


If we take the fraction: \frac.
3 is the denominator and the name of the fraction is "two thirds" -or, more generally, "two over three". (2 is the numerator.)

Negative Fractions

In fractions involving negatives, the denominator is made to be positive by convention. Since any factor of -1 can be multiplied out into the numerator, any fraction can be rewritten to have a positive denominator. For example,
\frac = 1 \times \frac = \frac \times \frac = \frac = \frac.
denominator in Aymara: Pachjiri
denominator in Catalan: Denominador
denominator in Spanish: Denominador
denominator in French: Dénominateur
denominator in Italian: Denominatore
denominator in Lombard: Denuminaduur
denominator in Dutch: Noemer
denominator in Portuguese: Denominador
denominator in Finnish: Nimittäjä
denominator in Thai: ตัวส่วน
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