See also: opac English English Wikipedia has an article on:OPACWikipedia Noun OPAC (plural OPACs) (library science) Acronym of online public access catalog. Anagrams copa, Paco, acop, APCO, capo, ACPO, CoAP, paco, OPCA, Copa, CapoWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads