unit in WordNet English dictionary

1. a single undivided natural thing occurring in the composition of something else
   "units of nucleic acids"
   unit  building block 
   
2. an organization regarded as part of a larger social group
   "the coach said the offensive unit did a good job"; "after the battle the soldier had trouble rejoining his unit"
   unit  social unit 
   
3. an assemblage of parts that is regarded as a single entity
   "how big is that part compared to the whole?"; "the team is a unit"
   whole  unit 
   
4. a single undivided whole
   "an idea is not a unit that can be moved from one brain to another"
   unit 
   
5. 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"
   unit of measurement  unit 
   
6. 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"
   unit