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From The Collaborative International Dictionary of English v.0.48:
Numerator \Nu"mer*a"tor\, n. [L. numerator: cf. F. num['e]rateur.] 1. One who numbers. [1913 Webster] 2. (Math.) The term in a fraction which indicates the number of fractional units that are taken. [1913 Webster] 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. [1913 Webster] Numeric