The definition of a flexitarian is someone who is mostly vegetarian, but occasionally eats meat.
A person who only eats vegetables but once a month eats a steak is an example of a flexitarian.
One who normally maintains a vegetarian diet but occasionally makes exceptions and eats meat or fish.
Of or relating to a diet that is primarily vegetarian but includes meat or fish on occasion.
(of a person) Being a flexitarian.
(of food, a diet, or the like) Being what a flexitarian might eat.