- something that must come before or is necessary to a subsequent result; condition: a precondition for a promotion.
- to subject (a person or thing) to a special treatment in preparation for a subsequent experience, process, test, etc.: to precondition a surface to receive paint.
- a necessary or required condition; prerequisite
- to present successively two stimuli to (an organism) without reinforcement so that they become associated; if a response is then conditioned to the second stimulus on its own, the same response will be evoked by the first stimulus
