English Etymology From definite + -ness. Pronunciation (UK) IPA(key): /ˈdɛfɪnɪtnəs/ Audio (US):(file) Noun definiteness (usually uncountable, plural definitenesses) The state or quality of being definite. Antonym: indefiniteness Related terms definitiondefinitivenessfinitenessfinitudefinityinfinitenessinfinitudeinfinity Translations the state or quality of being definite Finnish: definiittisyys (fi), määräisyys (fi) French: définitude (fr) f German: Bestimmtheit (de) Icelandic: ákveðni f Korean: 한정성 (限定性) Wikiwand - on Seamless Wikipedia browsing. On steroids.