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The Collaborative International Dictionary of English v.0.48 (gcide)

Quantity \Quan"ti*ty\, n.; pl. {Quantities}. [F. quantite, L.
quantitas, fr. quantus bow great, how much, akin to quam bow,
E. how, who. See {Who}.]
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1. The attribute of being so much, and not more or less; the
property of being measurable, or capable of increase and
decrease, multiplication and division; greatness; and more
concretely, that which answers the question "How much?";
measure in regard to bulk or amount; determinate or
comparative dimensions; measure; amount; bulk; extent;
size. Hence, in specific uses:
(a) (Logic) The extent or extension of a general
conception, that is, the number of species or
individuals to which it may be applied; also, its
content or comprehension, that is, the number of its
constituent qualities, attributes, or relations.
(b) (Gram.) The measure of a syllable; that which
determines the time in which it is pronounced; as, the
long or short quantity of a vowel or syllable.
(c) (Mus.) The relative duration of a tone.
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2. That which can be increased, diminished, or measured;
especially (Math.), anything to which mathematical
processes are applicable.
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Note: Quantity is discrete when it is applied to separate
objects, as in number; continuous, when the parts are
connected, either in succession, as in time, motion,
etc., or in extension, as by the dimensions of space,
viz., length, breadth, and thickness.
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3. A determinate or estimated amount; a sum or bulk; a
certain portion or part; sometimes, a considerable amount;
a large portion, bulk, or sum; as, a medicine taken in
quantities, that is, in large quantities.
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The quantity of extensive and curious information
which he had picked up during many months of
desultory, but not unprofitable, study. --Macaulay.
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{Quantity of estate} (Law), its time of continuance, or
degree of interest, as in fee, for life, or for years.
--Wharton (Law Dict. )

{Quantity of matter}, in a body, its mass, as determined by
its weight, or by its momentum under a given velocity.

{Quantity of motion} (Mech.), in a body, the relative amount
of its motion, as measured by its momentum, varying as the
product of mass and velocity.

{Known quantities} (Math.), quantities whose values are
given.

{Unknown quantities} (Math.), quantities whose values are
sought.
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