Units of measurement science entities are described in: the standard quantities such as the kelvin, the joule or the parsec that a concept, instrument or finding is expressed in. It excludes the instruments that produce a reading in a given unit and the concepts a unit measures, both of which have their own categories.
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1. Online Etymology Dictionary: unit
Online Etymology DictionaryOnline Etymology Dictionary, unit entryQuote, Online Etymology Dictionary, unit entry
1560s, "single number regarded as an undivided whole," an alteration of unity on the basis of digit.
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