Declension table of ?upaniṣada

Neuter	Singular	Dual	Plural
Nominative	upaniṣadam	upaniṣade	upaniṣadāni
Vocative	upaniṣada	upaniṣade	upaniṣadāni
Accusative	upaniṣadam	upaniṣade	upaniṣadāni
Instrumental	upaniṣadena	upaniṣadābhyām	upaniṣadaiḥ
Dative	upaniṣadāya	upaniṣadābhyām	upaniṣadebhyaḥ
Ablative	upaniṣadāt	upaniṣadābhyām	upaniṣadebhyaḥ
Genitive	upaniṣadasya	upaniṣadayoḥ	upaniṣadānām
Locative	upaniṣade	upaniṣadayoḥ	upaniṣadeṣu

Compound upaniṣada -

Adverb -upaniṣadam -upaniṣadāt