12th cent. From Latin aperire "to open."
From Proto-Italic *ap-wer-je- 'id.' The first element *ap- is from *h2ep- "off," "away" (see ab-); the rest is from Proto-Indo-European *h2u̯er-i̯e/o- "to cover." A primary i̯e/o-present.
Romance: Western Vulgar Latin: Asturian abrir, Portuguese abrir, Catalan obrir, French ouvrir, Italian aprire; Eastern Vulgar Latin: Aromanian apir; Sardinian: abbèrrere