Meaning of “set” - Learner’s Dictionary

set

noun [ C ] uk us /set/
GROUP

A2 a group of things that belong together:

a set of keys/tools
FILM/PLAY

B2 the place where a film or play is performed or recorded, and the pictures, furniture, etc that are used:

They first met on the set of 'Star Wars'.
TENNIS

B2 one part of a tennis match:

Nadal is leading by four games to one in the third set.
TV/RADIO

B1 a television or radio:

a TV set
MUSIC

a group of songs or tunes that go together to make a musical performance

MATHS

a group of numbers or things

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