Definition of quantity
1a : an indefinite amount or number
b : a determinate or estimated amount
c : total amount or number
d : a considerable amount or number —often used in plural generous quantities of luck— H. E. Putsch
2a : the aspect in which a thing is measurable in terms of greater, less, or equal or of increasing or decreasing magnitude
b : the subject of a mathematical operation
c : an individual considered with respect to a given situation an unknown quantity … as attorney general— Tom Wicker
3a : duration and intensity of speech sounds as distinct from their individual quality or phonemic character specifically : the relative length or brevity of a prosodic syllable in some languages (such as Greek and Latin)
b : the relative duration or time length of a speech sound or sound sequence
4 : the character of a logical proposition as being universal, particular, or singular
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