Declension table of ?tṛtīyatva

Neuter	Singular	Dual	Plural
Nominative	tṛtīyatvam	tṛtīyatve	tṛtīyatvāni
Vocative	tṛtīyatva	tṛtīyatve	tṛtīyatvāni
Accusative	tṛtīyatvam	tṛtīyatve	tṛtīyatvāni
Instrumental	tṛtīyatvena	tṛtīyatvābhyām	tṛtīyatvaiḥ
Dative	tṛtīyatvāya	tṛtīyatvābhyām	tṛtīyatvebhyaḥ
Ablative	tṛtīyatvāt	tṛtīyatvābhyām	tṛtīyatvebhyaḥ
Genitive	tṛtīyatvasya	tṛtīyatvayoḥ	tṛtīyatvānām
Locative	tṛtīyatve	tṛtīyatvayoḥ	tṛtīyatveṣu

Compound tṛtīyatva -

Adverb -tṛtīyatvam -tṛtīyatvāt