Emily Dickinson Lexicon

DE-NOM'IN-A-TOR, n.

1. He that gives a name.
2. In arithmetic, that number placed below the line in vulgar fractions, which shows into how many parts the integer is divided. 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, that is, three fifths.