As a Hindi name
पूर्णमा · noun · feminine
पूर्णिमा । पूर्णमासी — Śabdasāgara
पूर्णमा · pūrṇa-mā · s.f.
= pūrṇa-māsī, q.v.s.v. pūrṇa — Platts (1884), digital edition courtesy DSAL, University of Chicago, p. 279
As a Sanskrit word
Meaning
full-moon (day)
Verified derivationMultiple readings (2)Why this matches what you typed
The spelling you confirmed, पूर्णमा, is itself a dictionary headword — no grammatical transformation stands between what you typed and the meaning above.
Dictionary citations
pūrṇa—mā f. full-moon (day), L.
pūrṇimā, pūrṇimāsī, pūrṇamā The day of full moon; N. 2. 76.
pūrṇamā f. (-mā) The day of full moon. E. pūrṇa full, mā the moon; also pūrṇimā, &c.
Alternative readings
More than one analysis survives full verification. That ambiguity is real, so we show every reading rather than pick one silently.
Caveats
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