Declension table of ?adhivrata

Neuter	Singular	Dual	Plural
Nominative	adhivratam	adhivrate	adhivratāni
Vocative	adhivrata	adhivrate	adhivratāni
Accusative	adhivratam	adhivrate	adhivratāni
Instrumental	adhivratena	adhivratābhyām	adhivrataiḥ
Dative	adhivratāya	adhivratābhyām	adhivratebhyaḥ
Ablative	adhivratāt	adhivratābhyām	adhivratebhyaḥ
Genitive	adhivratasya	adhivratayoḥ	adhivratānām
Locative	adhivrate	adhivratayoḥ	adhivrateṣu

Compound adhivrata -

Adverb -adhivratam -adhivratāt