condition /kəndish″ən/ [L, condicere, to make arrangements] , 1. n., a state of being, specifically in reference to physical and mental health or well-being. 2. n., anything that is essential to or restricts or modifies the appearance or occurrence of something else. 3. v., to train a person or an animal, usually through specific exercises and repeated exposure to a particular state or thing. 4. v., (in psychology) to subject a person or animal to conditioning or associative learning so that a specific stimulus always elicits a particular response. See also classical conditioning.
