[check.out] n (1933) 1: the action or an instance of checking out
2: the time at which a lodger must vacate a room (as in a hotel) or be charged for retaining it
3: a counter or area in a store where goods are checked out
4. a: the action of examining and testing something for performance, suitability, or readiness b: the action of familiarizing oneself with the operation of a mechanical thing (as an airplane)