obliviscence
/əˈblɪvɪs(ə)ns/noun
Forgetting; an instance of this; (Psychology ) deterioration of the ability to remember learned material or perform a learned task which occurs after the learning has ceased.
Origin
Late 18th century; earliest use found in The Annual Register. From classical Latin oblīviscī to forget + -ence; compare -escence. Compare post-classical Latin obliviscentia, Middle French obliviscence.