Anticipation is an emotion involving pleasure in considering some expected or longed-for good event, or irritation at having to wait. Robert Plutchik listed anticipation as one of the eight basic emotions in his psychoevolutionary theory. See also hope.
In medicine, anticipation is where the severity of a genetic disorder increases with each generation. Measurement of anticipation is based on the age of the patient when they first displayed symptoms of the disease and comparing this to historical data about the average age of onset in past generations. It occurs in Huntington's disease and myotonic dystrophy.