n. 分子, 计算者, 计算的东西

[ noun ]
the dividend of a fraction
<noun.quantity>

Numerator \Nu"mer*a"tor\, n. [L. numerator: cf. F.
num['e]rateur.]
1. One who numbers.

2. (Math.) The term in a fraction which indicates the number
of fractional units that are taken.

Note: In a vulgar fraction the numerator is written above a
line; thus, in the fraction 5/9 (five ninths) 5 is the
numerator; in a decimal fraction it is the number which
follows the decimal point. See {Fraction}.