quantity

quantity, amount, number, sum

这些名词均有“总数、总量”之意。
quantity: 书面用词，指事物的总量和总数量，侧重大批计量，含准确测量的意味。
amount: 普通用词，与quantity近义，但强调整体，指把所有数量、重量及度量归并在一起得出的总数。
number: 普通用词，指人或物的数目，强调数的概念。
sum: 普通用词，指简单加算的结果。

名词 quantity:

1. how much there is of something that you can quantify
   同义词：measure, amount
2. an adequate or large amount
3. something that has a magnitude and can be represented in mathematical expressions by a constant or a variable

1. The new sales director is still a bit of an unknown quantity.
   新来的销售部主任大家还不大了解。
2. This company is more concerned with quality than with quantity.
   这家公司对质量比对产量更重视。
3. The factory turns out a large quantity of paper products.
   这家工厂生产大量的纸制品。
4. A large quantity of air-conditioners has been sold since the temperature is high.
   因为气温很高，有大量空调售出。
5. It was a bad year for films, in terms of both quantity and quality.
   今年的电影无论从数量上还是质量上都说不上好。

quan.ti.ty

n.（名词）
【复数】 quan.ti.ties 缩写 qt.,qty.

A specified or indefinite number or amount.
数量：特定的或不确定的数或量
A considerable amount or number:
大量：可观的数或量：
例句：
sells drugs wholesale and in quantity.
大量批发销售药品

An exact amount or number.
量：确定的数或量
The measurable, countable, or comparable property or aspect of a thing.
可计算的数额：一事物可测量的、可计算的或可比较的特性或方面
Mathematics Something that serves as the object of an operation.
【数学】 量：作为运算对象的物体

Linguistics The relative amount of time needed to pronounce a vowel, consonant, or syllable.
【语言学】 音量：发出某元音、辅音或音节所需时间的相对量
The duration of a syllable in quantitative verse.
音节长短：在音量的诗歌中某音节的音长
Logic The exact character of a proposition in reference to its universality, singularity, or particularity.
【逻辑学】 （命题的）量：关于某一命题的普遍性、独特性或特殊性的正确属性

来源：
Middle English quantite
中古英语 quantite
from Old French
源自 古法语
from Latin quantit3s quantit3t-
源自 拉丁语 quantit3s quantit3t-
from quantus [how great] * see k wo-
源自 quantus [多大] *参见 k wo-