Answer:
It is the tendency of a new stimulus that is similar to the original conditioned stimulus to elicit a response that is similar to the conditioned response.
Explanation:
Stimulus generalization: In classical conditioning, the term stimulus generalization refers to the propensity of the conditioned stimulus to give rise to the same responses once the response is being conditioned.
In other words, stimulus generalization arises when an organism (human being, animals, etc) responds to a particular stimulus, the way it responds to a similar or same stimulus.