To state or describe the nature, scope, or meaning of something. The teacher asked the students to define the term 'ecosystem' in their own words.
To mark out the boundary or limits of something. The fence helps to define the property line between the two houses.
To make something clear or distinct. The artist used bold lines to define the shapes in the painting.
To be the essential quality or characteristic of someone or something; to characterize or distinguish. Her compassion is what truly defines her as a leader.