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quantity

quantity /ˈkwɑːntəti/ noun
plural quantities
quantity
/ˈkwɑːntəti/
noun
plural quantities
Britannica Dictionary definition of QUANTITY
: an amount or number of something
[count]
often + of
[noncount]
abbreviation qty.
: a large amount or number of something
[count]
+ of
[noncount]

known quantity

: someone or something whose abilities or characteristics are well known

unknown quantity

: someone or something whose abilities or characteristics are not yet known