noun, accusative singular (neuter)
Etymology. From √sena 'army' or cognate with Sanskrit śayana 'lying, bed'; the prefix-like element sena- and the suffix -āsana ('sitting, abode') may combine the sense of a place where the Saṅgha assembles or rests.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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