A specified or indefinite number or amount. A considerable amount or number: sells drugs wholesale and in quantity. An exact amount or number. The measurable, countable, or comparable property or aspect of a thing. Mathematics Something that serves as the object of an operation. Linguistics The relative amount of time needed to pronounce a vowel, consonant, or syllable. The duration of a syllable in quantitative verse. Logic The exact character of a proposition in reference to its universality, singularity, or particularity.