Home › Words › N › nonreturnnonreturnnonreturn means allowing air or liquid to travel in one direction only, and not permitting its return. (of a valve).Among words judged in Lexicurio's Arena, nonreturn ranks #36,618 of 42,749 for Qualifying.EtymologyFrom non- + return.adjAllowing air or liquid to travel in one direction only, and not permitting its return. (of a valve)nounAbsence of return; failure to come back or bring back.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.nonreturner 73% match — One who does not return (to a previous location, way of life, etc.). vs nonreturn →unreturningly 70% match — Without returning or coming back. vs nonreturn →nonreturnable 67% match — Unable to be returned. vs nonreturn →nonreplacement 66% match — Failure to replace; absence of replacement. vs nonreturn →nonreception 63% match — Absence of reception; failure to receive. vs nonreturn →unreturned 63% match — Not returned; unrequited; not reciprocated. vs nonreturn →nonreversion 63% match — Lack of reversion; failure to revert. vs nonreturn →unreciprocation 63% match — Absence of reciprocation. vs nonreturn →