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|Noun||1.||fundamental quantity - one of the four quantities that are the basis of systems of measurement|
quantity, measure, amount - how much there is or how many there are of something that you can quantify
temperature - the degree of hotness or coldness of a body or environment (corresponding to its molecular activity)
mass - the property of a body that causes it to have weight in a gravitational field
length - the linear extent in space from one end to the other; the longest dimension of something that is fixed in place; "the length of the table was 5 feet"