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quan·ti·ty /ˈkwɑntəti/

量,數量,許多,大量

quantity

量; ( 定 )額; 數( 目 ); 參數; 值; 數量; 大量 QTY

From: Network Terminology

quantity

量 數量

Quan·ti·ty n.; *pl.* Quantities

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.

2. That which can be increased, diminished, or measured; especially Math., anything to which mathematical processes are applicable.

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.

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.

*The quantity of extensive and curious information which he had picked up during many months of desultory, but not unprofitable, study.* --*Macaulay.*

**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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From: WordNet (r) 2.0

quantity

n 1: how much there is of something that you can quantify [syn: measure,

amount]

2: an adequate or large amount; "he had a quantity of

ammunition"

3: something that has a magnitude and can be represented in

mathematical expressions by a constant or a variable