If the original sense was "of the morning," possibly from Proto-Indo-Iranian *wāsarás, a vṛddhi derivative of *wásr̥ (“spring”). If so, related to वसन्त (vasanta, “spring”).[1][2]
Gamkrelidze et al. instead prefer a derivation from Proto-Indo-European *h₂wes- (“to stay, dwell, spend the night”), also the source of वसति (vasati, “staying, dwelling”).[3]
वासर • (vāsara) stem, m or n
| singular | dual | plural | |
|---|---|---|---|
| nominative | वासरः (vāsaraḥ) | वासरौ (vāsarau) वासरा¹ (vāsarā¹) |
वासराः (vāsarāḥ) वासरासः¹ (vāsarāsaḥ¹) |
| vocative | वासर (vāsara) | वासरौ (vāsarau) वासरा¹ (vāsarā¹) |
वासराः (vāsarāḥ) वासरासः¹ (vāsarāsaḥ¹) |
| accusative | वासरम् (vāsaram) | वासरौ (vāsarau) वासरा¹ (vāsarā¹) |
वासरान् (vāsarān) |
| instrumental | वासरेण (vāsareṇa) | वासराभ्याम् (vāsarābhyām) | वासरैः (vāsaraiḥ) वासरेभिः¹ (vāsarebhiḥ¹) |
| dative | वासराय (vāsarāya) | वासराभ्याम् (vāsarābhyām) | वासरेभ्यः (vāsarebhyaḥ) |
| ablative | वासरात् (vāsarāt) | वासराभ्याम् (vāsarābhyām) | वासरेभ्यः (vāsarebhyaḥ) |
| genitive | वासरस्य (vāsarasya) | वासरयोः (vāsarayoḥ) | वासराणाम् (vāsarāṇām) |
| locative | वासरे (vāsare) | वासरयोः (vāsarayoḥ) | वासरेषु (vāsareṣu) |
| singular | dual | plural | |
|---|---|---|---|
| nominative | वासरम् (vāsaram) | वासरे (vāsare) | वासराणि (vāsarāṇi) वासरा¹ (vāsarā¹) |
| vocative | वासर (vāsara) | वासरे (vāsare) | वासराणि (vāsarāṇi) वासरा¹ (vāsarā¹) |
| accusative | वासरम् (vāsaram) | वासरे (vāsare) | वासराणि (vāsarāṇi) वासरा¹ (vāsarā¹) |
| instrumental | वासरेण (vāsareṇa) | वासराभ्याम् (vāsarābhyām) | वासरैः (vāsaraiḥ) वासरेभिः¹ (vāsarebhiḥ¹) |
| dative | वासराय (vāsarāya) | वासराभ्याम् (vāsarābhyām) | वासरेभ्यः (vāsarebhyaḥ) |
| ablative | वासरात् (vāsarāt) | वासराभ्याम् (vāsarābhyām) | वासरेभ्यः (vāsarebhyaḥ) |
| genitive | वासरस्य (vāsarasya) | वासरयोः (vāsarayoḥ) | वासराणाम् (vāsarāṇām) |
| locative | वासरे (vāsare) | वासरयोः (vāsarayoḥ) | वासरेषु (vāsareṣu) |