1. (noun)unit of measurement, unit any division of quantity accepted as a standard of measurement or exchange "the dollar is the United States unit of currency"; "a unit of wheat is a bushel"; "change per unit volume"
2. (noun)unit an individual or group or structure or other entity regarded as a structural or functional constituent of a whole "the reduced the number of units and installations"; "the word is a basic linguistic unit"
3. (noun)unit, social unit an organization regarded as part of a larger socialgroup "the coach said the offensive unit did a good job"; "after the battle the soldier had trouble rejoining his unit"
4. (noun)unit a single undivided whole "an idea is not a unit that can be moved from one brain to another"
5. (noun)unit, building block a single undivided naturalthing occurring in the composition of something else
"units of nucleic acids"
6. (noun)whole, unit an assemblage of parts that is regarded as a singleentity "how big is that part compared to the whole?"; "the team is a unit"