Final answer:
Overlearning is related to fluency, as it refers to the practice of a skill beyond initial mastery, ensuring smooth and automatic performance.
Step-by-step explanation:
Overlearning is a concept related to the process of practicing a skill beyond the point of initial mastery. Within the context of fluency, overlearning is about ensuring the skill becomes automatic and performance can be highly effective with minimal cognitive effort. It is not directly related to acquisition, which is about the initial learning phase, or to generalization, which refers to applying the learned skill to different contexts or stimuli. Overlearning enhances the fluency of the skill, making it deeply ingrained and easily accessible.