—v.t. 1. to state or set forth the meaning of (a word, phrase, etc.): They disagreed on how to define “liberal.” 2. to explain or identify the nature or essential qualities of; describe: to define judicial functions. 3. to fix or lay down definitely; specify distinctly: to define one's responsibilities. 4. to determine or fix the boundaries or extent of: to define property with stakes. 5. to make clear the outline or form of: The roof was boldly defined against the sky.
—v.i. to set forth the meaning of a word, phrase, etc.; construct a definition.