de·con·di·tion (d  k n-d sh n)v. de·con·di·tioned, de·con·di·tion·ing, de·con·di·tions v.tr. 1. Psychology To cause (a conditioned response, such as a phobia) to become extinct. 2. To cause to decline from a condition of physical fitness, as through a prolonged period of inactivity or, in astronauts, through weightlessness in space. v.intr. To lose physical fitness. |
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