Final answer:
Reconsolidation is the term that describes the process of memory becoming sensitive after reactivation, similar to when it was first formed.
Step-by-step explanation:
The term that best describes the process by which reactivating a memory makes it sensitive just as it had been immediately after the memory was first formed is Reconsolidation. Reconsolidation refers to the process of stabilizing a memory after it has been retrieved. When a memory is reactivated, it becomes temporarily fragile and susceptible to change. However, through the process of reconsolidation, the memory is strengthened and returned to long-term storage.