Latin Etymology existēns + -ia Noun existentia f (genitive existentiae); first declension existence 1738, Christian Wolff, Theologia Naturālis, II, §20:Existentia necessāria et contingēns reālitās est.(please add an English translation of this quotation) Existence ist the necessary and encompassing reality. Declension First-declension noun.More information singular, plural ... singular plural nominative existentia existentiae genitive existentiae existentiārum dative existentiae existentiīs accusative existentiam existentiās ablative existentiā existentiīs vocative existentia existentiae Close Related terms existō Descendants Catalan: existència French: existence Galician: existencia Italian: esistenza Ligurian: existénsa Occitan: existéncia Piedmontese: esistensa Portuguese: existência Romanian: existență Spanish: existencia Wikiwand - on Seamless Wikipedia browsing. On steroids.