Declension table of ?triyavastha

Masculine	Singular	Dual	Plural
Nominative	triyavasthaḥ	triyavasthau	triyavasthāḥ
Vocative	triyavastha	triyavasthau	triyavasthāḥ
Accusative	triyavastham	triyavasthau	triyavasthān
Instrumental	triyavasthena	triyavasthābhyām	triyavasthaiḥ triyavasthebhiḥ
Dative	triyavasthāya	triyavasthābhyām	triyavasthebhyaḥ
Ablative	triyavasthāt	triyavasthābhyām	triyavasthebhyaḥ
Genitive	triyavasthasya	triyavasthayoḥ	triyavasthānām
Locative	triyavasthe	triyavasthayoḥ	triyavastheṣu

Compound triyavastha -

Adverb -triyavastham -triyavasthāt