on time is special, as it is an adverb, but it is not uncommon to see it as an adjective thus: We give you on-time solutions to your problems.

What is a word for being on time?

The word has meant lots of other things through the centuries, usually involving being precise about small points. And today punctuality is all about time; a punctual train or a punctual payment or a punctual person shows up "on the dot".

How do you describe being on time?

Punctuality is the characteristic of being able to complete a required task or fulfill an obligation before or at a previously designated time. "Punctual" is often used synonymously with "on time".