Definite:
1. Clearly defined or stated; not vague or ambiguous.
* Synonyms: clear, precise, explicit, specific, certain, fixed, established
* Antonyms: vague, indefinite, ambiguous, uncertain
2. Having a fixed or certain limit or end.
* Synonyms: limited, bounded, finite, restricted, absolute
* Antonyms: unlimited, unbounded, infinite, indefinite
Example sentences:
* He gave me a definite answer to my question.
* The deadline for the project is definite - it's next Friday.
* There is no definite proof that the theory is true.
In summary: Definite means something is clearly defined, not ambiguous, and has a fixed or certain limit.