first-come-first-served adjective 1first come first served noun 1first come, first served phrase 1 adjective1 •Of a process or situation in which one is dealt with in the order in which ones arrives.Effective March 30, 2006, the State of Virginia no longer follows their “first come, first served” policy regarding allocation of multiple child support orders. — 2006 first come first served noun1 •A service policy or distributive rule under which access to a good, service, or decision is allocated according to the chronological order of requests or arrivals, so that earlier claimants receive priority over later ones. first come, first served phrase1 •One will be dealt with in the order in which one arrives.