Meaning of “dimension” - Learner’s Dictionary

dimension

noun [ C ] uk us /ˌdaɪˈmenʃən/
PART

B2 a particular part of a situation, especially something that affects how you think or feel:

Music has added a new dimension to my life.
MEASUREMENT

B2 a measurement of the length, width, or height of something:

[ usually plural ] We need to know the exact dimensions (= size) of the room.

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