Real Dictionary

diet
variable noun: Your diet is the type and range of food that you regularly eat.

diet in American English 1
to eat or cause to eat special or limited food, esp. for losing weight
what a person or animal usually eats and drinks; daily fare
adjective: suitable for consumption with a weight-reduction diet; dietetic
intransitive verb: to select or limit the food one eats to improve one's physical condition or to lose weight
noun: food and drink considered in terms of its qualities, composition, and its effects on health
transitive verb: to regulate the food of, esp. in order to improve the physical condition

diet in American English 2
a day's session of an assembly
noun: the legislative body of certain countries, as Japan

diet in British English 1
noun: a specific allowance or selection of food, esp prescribed to control weight or in disorders in which certain foods are contraindicated
verb: to follow or cause to follow a dietary regimen

diet in British English 2
noun: a legislative assembly in various countries, such as Japan