Definition of "Unit" :

noun: an assemblage of parts that is regarded as a single entity

"The team is a unit."

noun: a single undivided whole

"An idea is not a unit that can be moved from one brain to another."

noun: an organization regarded as part of a larger social group

"The coach said the offensive unit did a good job."

noun: a single undivided natural thing occurring in the composition of something else

"Units of nucleic acids."

noun: any division of quantity accepted as a standard of measurement or exchange

"The dollar is the United States unit of currency."

noun: 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."