The genitive case is formed in the second declension (omicron stem; for declensions, see NOUN) with the connecting vowel followed by upsilon (-ου) and in the first declension (alpha or eta stem) with the connecting vowel followed by sigma (-ης or -ας). The third declension genitive singular ending is -ος. The plural ending is always -ων, whether in the first, second, or third declension. Genitive Forms Highlighted 2nd Decl. 1st Decl. 2nd Decl. Neut. 3rd Decl. 3rd
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