the amount or number of a material or immaterial thing not usually estimated by spatial ... the quantity and quality of the fruit can be controlled note down the sizes, colors, and quantities that you require
the amount or number of a material or abstract thing not usually estimated by spatial measurement: the quantity and quality of the fruit can be controlled
a person or thing whose nature, value, or significance cannot be determined or is not yet known:the producers replaced her with an unknown quantity a student ensemble is always something of an unknown quantity