1. to explain the meaning of a word or phrase
2. to describe the nature or basic qualities of something
3. to mark the boundaries or limits of something

Examples

• Please define the word ‘democracy’ for the class.
• The dictionary defines courage as bravery in the face of danger.
• Her kindness and generosity define who she is as a person.
• The fence defines the property line between the two houses.
• We need to define our goals before starting the project.
• The mountains define the horizon in this landscape.
• Can you define what success means to you?