Define (verb)

1. To state the precise meaning of (a word or sense of a word, for example).
2. To describe, explain or make definite and clear.
3. To mark the limit of; to bound; to bring to a termination.
4. To define a problem or situation is to describe it in detail, often giving information about what caused it or what the effects are.
5. To determine or fix the boundaries or extent of something.

Origin:

From middle english diffinen, borrowed from old french definer, from latin dēfīnīre (“to limit, fix, set boundaries to”), from de- + fīnīre (“to end, limit, bound”), from fīnis (“end, limit, boundary”).

Examples:

1. The dictionary defines 'pandemic' as a widespread disease that affects many people in a given area or worldwide.
2. She tried to define her role in the company.
3. The fence defined the boundary between their properties.
4. The report defines the problem and outlines possible solutions.
5. The contract defines the scope of the work.