30.4 If the stem of the adjective ends in –ε, –ι, or –ρ, the singular forms of the 1st DECLENSION change the –η– to –-. Note that this change matches that of 1st DECLENSION NOUNS.

(S 287, G 76)

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Note that the FEMININE GENITIVE PLURAL form, δικαίων, does not follow the rule for 1st declension nouns, namely that the genitive plural ends in –ῶν. For adjectives, if ALL THREE GENDERS share the same form for the GENITIVE PLURAL (e.g., δικαιων), then the feminine form is regularized to follow the same accent pattern as the masculine and neuter.

 

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