Definitions from Wiktionary ( )

▸ noun:  A fundamental, generic term used when referring to the measurement (count, amount) of a scalar, vector, number of items or to some other way of denominating the value of a collection or group of items.
▸ noun:  An indefinite amount of something.
▸ noun:  A specific measured amount.
▸ noun:  A considerable measure or amount.
▸ noun:  (metrology) Property of a phenomenon, body, or substance, where the property has a magnitude that can be expressed as number and a reference.
▸ noun:  (mathematics) Indicates that the entire preceding expression is henceforth considered a single object.
▸ noun:  (phonology) Length of sounds.

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