what is a unit?

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It depends on what kind of unit:Theres a unit of measurement: any division of quantity accepted as a standard of measurement or exchange.Also "the word is a basic linguistic unit" an organization regarded as part of a larger social group;a single undivided whole"a team is a unit"

There are loads of answers for that, it depends on what type of unit you are talking about.try this site;http://www.answers.com/topic/unitit might help!