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English definition of “quantity”

quantity

noun [C or U]     /ˈkwɒn.tɪ.ti/ US  /ˈkwɑːn.t̬ə.t̬i/
B1 the amount or number of something, especially that can be measured or is fixed : Police found a large / small quantity of drugs in his possession . We consumed vast quantities of food and drink that night . The ( sheer ) quantity (= large amount ) of equipment needed for the trip is staggering . They are now developing ways to produce the vaccine in large quantities and cheaply . This recipe is only for four, so I usually do double the quantity if I'm cooking for my family . It's quality not quantity that really counts .General words for size and amount Grammar:Amount of, number of or quantity of?Grammar:Amount of or number of?We use amount of with uncountable nouns. Number of is used with countable nouns:Grammar:A quantity of or quantities of?Quantity is more formal than amount or number. A quantity of or quantities of can be followed by a countable noun or an uncountable noun. They are most commonly used with an adjective such as huge, big, large, small:
(Definition of quantity noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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