unit (Noun) — Any division of quantity accepted as a standard of measurement or exchange. ex. "a unit of wheat is a bushel" ex. "change per unit volume" ex. "the dollar is the United States unit of currency"
unit (Noun) — An individual or group or structure or other entity regarded as a structural or functional constituent of a whole. ex. "the reduced the number of units and installations" ex. "the word is a basic linguistic unit"
unit (Noun) — An organization regarded as part of a larger social group. ex. "after the battle the soldier had trouble rejoining his unit" ex. "the coach said the offensive unit did a good job"
unit (Noun) — A single undivided whole. ex. "an idea is not a unit that can be moved from one brain to another"
unit (Noun) — A single undivided natural thing occurring in the composition of something else. ex. "units of nucleic acids"
unit (Noun) — An assemblage of parts that is regarded as a single entity. ex. "the team is a unit"