better(adjective)

good to a greater extent

His new car is better than his old one.

better(adjective)

stronger in health; recovered (from an illness)

I feel better today; She's better now.

better(adjective)

preferable

Better to do it now than later.

better(adverb)

well to a greater extent

He sings better now than he did before.

better(pronoun)

someone or something which is good to a greater extent than the other (of two people or things)

He's the better of the two.

better(verb)

to improve (on)

He's bettered all previous records; The situation has bettered a little.