A computer technology that simulates a real or imagined environment so that the user can interact with it as if physically present.

A check or review to make sure something is consistent, reasonable, etc. / (idiomatic) A wake-up call, reminder.

(humorous, euphemistic, of a person) Crazy, bonkers, insane.

(television) A genre of television programming portraying one or more people who are not professional actors and depicting their reactions to given stimuli or goals.

Having at least some basis in reality

(computing) The merging of a view of the real-world environment upon a digital image in real time.

Alternative form of reality television

The set of things considered to be real according to the majority of individuals.

plural of reality show

A reality television program.