1.nounThe food and beverage a person or animal consumes.
"The diet of the Giant Panda consists mainly of bamboo."
2.nounA controlled regimen of food and drink, as to gain or lose weight or otherwise influence health.
3.noun(by extension) Any habitual intake or consumption.
"He's been reading a steady diet of nonfiction for the last several years."
4.adjective(of a food or beverage) Containing less fat, salt, sugar, or calories than normal, or claimed to have such.
"diet soda"
5.adjectiveHaving certain traits subtracted.
"You folks reduce it to the bible only as being authoritative, impoverishing the faith. "Christianity Lite", diet Christianity for those who can't handle the Whole Meal."