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English word forgettance comes from English forget, English -ance
forget (English)
(intransitive) To cease remembering.. (slang) euphemism for fuck, screw (a mild oath).. (transitive) To lose remembrance of.. (transitive) To unintentionally leave something behind.. (transitive) To unintentionally not do, neglect.
-ance (English)
A process or action.. Added to the stem of a verb to form a noun indicating a state or condition, such as result or capacity, associated with the verb.
forgettance (English)
(rare) The act of forgetting.