Real Dictionary

unit
countable noun: A unit is a group of people who work together at a specific job, often in a particular place.
countable noun: If you consider something as a unit, you consider it as a single, complete thing.

Unit in American English
the smallest whole number; one
Unitarian
noun: a single thing or person

unit in British English
noun: a single undivided entity or whole

unit in Mechanical Engineering
noun: A unit is a mechanical part or set of parts that performs a function within a larger system.

unit in Retail
noun: A unit is a single item. In retailing, a unit may be a pair of shoes, a bag of sugar, a box of chocolates, a gallon of gas, or a set of golf clubs.

unit in the Pharmaceutical Industry
noun: A unit is the amount of a drug, vaccine, etc, needed to produce a particular effect.

Unit. in American English
abbreviation: Unitarian

Unit. in British English
abbreviation for: Unitarian