Definite (adjective)

1. Clearly defined or determined; not vague or general.
2. Clearly distinguishable; unmistakable.
3. Having a fixed or known value.
4. Grammar: Referring to a particular person, thing, or group identified or specified.
5. Mathematics: Having distinct boundaries.

Origin:

From latin definitus, past participle of definire (“to define, determine”), from de + finire (“to limit, bound”), from finis (“end, limit”).

Examples:

1. The plan should have definite objectives.
2. Her smile was a definite sign of happiness.
3. The definite answer is 'yes'.
4. In the sentence 'I saw the dog,' 'the' is a definite article.
5. The definite integral of a function is often used to find the area under its curve.