Definition:Rational Number/Fraction/Denominator

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Let $\dfrac a b$ be a fraction.

The term $b$ is known as the denominator of $\dfrac a b$.

Also see

Linguistic Note

The term denominator derives from the word denomination which, in this context, means grouping of elements of the same kind.

Thus, in the fraction $\dfrac 3 4$, it states that the objects of the same kind in question (of which the numerator specifies that there are $3$) are quarters.