expression, i-adjective
not in one's memory; have no recollection of
Used when the speaker has no memory of an event or fact. Often implies that the event did not happen or was not noticed, rather than simply being forgotten.
そんなことは記憶にない。
I have no recollection of such a thing.
彼に会った記憶にない。
I don't remember meeting him.
Similar meaning, but 覚えがない is more colloquial and can imply a stronger denial of responsibility or awareness.
Phrase composed of 記憶 (memory) + に (particle) + ない (not exist). Literally 'not in memory'.