Home › Words › O › oncenessoncenessonceness means the state or condition of being once; singularity.Among words judged in Lexicurio's Arena, onceness ranks #29,665 of 42,752 for Qualifying.EtymologyFrom once + -ness.nounThe state or condition of being once; singularity.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.onliness 69% match — The state of being alone or unique. vs onceness →oncet 68% match — Once. vs onceness →oneliness 67% match — The state of being one or single. vs onceness →nonce 65% match — The one or single occasion; the present reason or purpose. vs onceness →uniquity 61% match — The state or quality of being unique. vs onceness →uniqueness 60% match — The state or quality of being unique or one of a kind. vs onceness →undoneness 60% match — The quality of being undone. vs onceness →onefoldness 59% match — The property of being onefold. vs onceness →