Meaning of “ball” - Learner’s Dictionary

ball

noun [ C ] uk us /bɔːl/
ROUND OBJECT

A1 a round object that you throw, kick, or hit in a game, or something with this shape:

a tennis ball
a ball of string
The cat curled itself into a ball.
DANCE
have a ball informal

to enjoy yourself very much:

We had a ball in Miami.

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