1. To state or describe exactly the meaning of a word or phrase:
* Example: "Can you define the word 'serendipity'?"
2. To set the limits or boundaries of something:
* Example: "The company's new policy defines the acceptable use of company resources."
3. To determine or fix the nature, character, or form of something:
* Example: "The architect's design defines the shape of the building."
4. To make clear or distinct:
* Example: "The outline of the mountain was defined against the clear sky."
5. To establish or constitute:
* Example: "The success of the project defined our team's reputation."
In short, "define" means to make something clear, specific, or precise.