| Term | Definition |
| ὤν | Singular Male Nominative (Subject) |
| ὄντος | Singular Male Genitive (Of/From) |
| ὄντι | Singular Male Dative (To/For/Location/By) |
| ὄντα | Singular Male Accusative (Involving Motion) |
| ὄντες | Plural Male Nominative (Subject) |
| ὄντων | Plural Male Genitive (Of/From) |
| οὖσι(ν) | Plural Male Dative (To/For/Location/By) |
| ὄντας | Plural Male Accusative (Involving Motion) |
| οὖσα | Singular Female Nominative (Subject) |
| οὔσης | Singular Female Genitive (Of/From) |
| οὔσῃ | Singular Female Dative (To/For/Location/By) |
| οὖσαν | Singular Female Accusative (Involving Motion) |
| οὖσαι | Plural Female Nominative (Subject) |
| οὐσῶν | Plural Female Genitive (Of/From) |
| οὔσαις | Plural Female Dative (To/For/Location/By) |
| οὔσας | Plural Female Accusative (Involving Motion) |
| ὄν | Singular Neutral Nominative (Subject) |
| ὄντος | Singular Neutral Genitive (Of/From) |
| ὄντι | Singular Neutral Dative (To/For/Location/By) |
| ὄν | Singular Neutral Accusative (Involving Motion) |
| ὄντα | Plural Neutral Nominative (Subject) |
| ὄντων | Plural Neutral Genitive (Of/From) |
| οὖσι | Plural Neutral Dative (To/For/Location/By) |
| ὄντα | Plural Neutral Accusative (Involving Motion) |