The food and beverage a person or animal consumes.

“The diet of the Giant Panda consists mainly of bamboo.”

A controlled regimen of food and drink, as to gain or lose weight or otherwise influence health.

(by extension) Any habitual intake or consumption.

“He's been reading a steady diet of nonfiction for the last several years.”

To regulate the food of (someone); to put on a diet.

To modify one's food and beverage intake so as to decrease or increase body weight or influence health.

“I've been dieting for six months, and have lost some weight.”

To eat; to take one's meals.

(usually capitalized as a proper noun) A council or assembly of leaders; a formal deliberative assembly.

“They were given representation of some important diet committees.”

A session of exams

The proceedings under a criminal libel.