As a deity name
Name 691 of the Durga Sahasranāma — Kula Arnava Tantra / Skanda Purana, as taught by Lord Shiva to Goddess Parvati
As a Hindi name
अवन्तिका · avantikā · s.f.
Name of a city, the modern Oujain — Platts (1884), digital edition courtesy DSAL, University of Chicago, p. 108
As a Sanskrit word
Meaning
the modern Oujein (one of the seven sacred cities of the Hindūs to die at which secures eternal happiness), the language of the Avantis
Scripturally attested Verified derivationMultiple readings (2)Why this matches what you typed
The spelling you confirmed, अवन्तिका, is itself a dictionary headword — no grammatical transformation stands between what you typed and the meaning above.
Dictionary citations
avantikā f. the modern Oujein (one of the seven sacred cities of the Hindūs to die at which secures eternal happiness), the language of the Avantis, Sāh.
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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