Meaning of “unit” - Learner’s Dictionary

unit

noun [ C ] uk us /ˈjuːnɪt/
GROUP

a group of people who are responsible for a particular part of an organization:

MEASURE

a measure used to express an amount or quantity:

The kilogram is a unit of weight.
SINGLE

B1 a single, complete thing that may be part of a larger thing:

a French course book with ten units
FURNITURE

a piece of furniture that fits together with other pieces:

kitchen units
MACHINE

a small machine, or part of a machine, that has a particular purpose:

a computer's central processing unit
BUILDING

(Definition of “unit” from the Cambridge Learner’s Dictionary © Cambridge University Press)