1580s, "act of remembering," from Late Latin reminiscentia "remembrance, recollection," from reminiscentem (nominative reminiscens), present participle of reminisci "remember, recall to mind," from re- "again" + minisci "to remember," from root of mens "mind," from PIE root *men- "mind, understanding, reason" (see mind (n.)). Meaning "a recollection of something past" is attested from 1811.