Declension table of ?mahādevīya

Masculine	Singular	Dual	Plural
Nominative	mahādevīyaḥ	mahādevīyau	mahādevīyāḥ
Vocative	mahādevīya	mahādevīyau	mahādevīyāḥ
Accusative	mahādevīyam	mahādevīyau	mahādevīyān
Instrumental	mahādevīyena	mahādevīyābhyām	mahādevīyaiḥ mahādevīyebhiḥ
Dative	mahādevīyāya	mahādevīyābhyām	mahādevīyebhyaḥ
Ablative	mahādevīyāt	mahādevīyābhyām	mahādevīyebhyaḥ
Genitive	mahādevīyasya	mahādevīyayoḥ	mahādevīyānām
Locative	mahādevīye	mahādevīyayoḥ	mahādevīyeṣu

Compound mahādevīya -

Adverb -mahādevīyam -mahādevīyāt