Conditioned Response (CR)
In classical conditioning, the conditioned response (CR) is the learned response (reflexive behavior) to a conditioned stimulus (CS). This response is almost identical to the Unconditioned Stimulus except that now the reflexive behavior occurs in response to a conditioned stimulus as opposed to an unconditioned stimulus.
For example, a dog salivates (UR) from the smell of a bone (US) naturally, without any conditioning. Once some neutral stimulus (CS) (for example, a "beep" that the dog would not naturally or normally cause the dog to salivate) has been paired with the bone for some time, the dog will salivate (CR) when the "beep" occurs.