Meaning

adjective pertaining to a process or series of actions for achieving a result

adjective fit or ready for use or service

adjective (military) of or intended for or involved in military operations

originEtymology tree Proto-Indo-European *h₃ep- Proto-Indo-European *-os Proto-Indo-European *h₃épos Proto-Italic *opos Latin opus Latin opera Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-yéti Proto-Indo-European *-eh₂yéti Proto-Italic *-āō Latin -or Latin operor Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin…

Etymology from Wiktionary, CC BY-SA 3.0