immunological memory

noun

im·​mu·​no·​log·​i·​cal memory ˌim-yən-ᵊl-ˈäj-i-kəl- 

variants also immunologic memory

-ˈäj-ik- 

: the capacity of the body's immune system to remember an encounter with an antigen due to the activation of B cells or T cells having specificity for the antigen and to react more swiftly to the antigen by means of these activated cells in a later encounter