adjective
Definition: Something that is enjoyable or entertaining, often causing laughter or happiness.
Example: The party was so much fun that everyone wanted to stay longer.
intransitive verb
Definition: To act in a playful or joking manner.
Example: The children love to fun around in the park.
noun
Definition: A source of enjoyment or amusement that makes people happy.
Example: We had a lot of fun at the amusement park.