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Noun quantity has 3 senses
 measure, quantity, amount  how much there is of something that you can quantify
_{1} is a kind of abstraction
_{1} has particulars:  probability, chance; quantum; value, economic value; fundamental quantity, fundamental measure; definite quantity; indefinite quantity; relative quantity; system of measurement, metric; cordage; octane number, octane rating; linear measure, long measure; magnetization, magnetisation; volume; volume; proof; time unit, unit of time; point, point in time; playing period, period of play, play; time interval, interval 
 quantity  an adequate or large amount; "he had a quantity of ammunition"
_{2} is a kind of amount
_{2} has particulars: abundance, copiousness, teemingness
 quantity  something that has a magnitude and can be represented in mathematical expressions by a constant or a variable
_{3} is a kind of concept, conception, construct
_{3} has particulars:
