अत्र

• (Vedic) IPA^(key): /ɐ́t.ɾɐ/
• (Classical Sanskrit) IPA^(key): /ˈɐt̪.ɾɐ/

From Proto-Indo-Iranian *átra (“there, to that place”), cognate with Avestan 𐬀𐬚𐬭𐬀 (aθra, “there, to that place”), 𐬀𐬚𐬭𐬁 (aθrā), derived from the anaphoric pronominal stem Proto-Indo-European *h₁e (“he/she, aforementioned”), which was suppletive to *ís.^[1]

अत्र • (átra)

1. here, in this place
2. at this time
3. in this manner
   • (Can we date this quote?), The Buddha, Dhammapada(pāḷi) (subsequently translated from Pali to Sanskrit), Yamakavagga, page 26; republished in The Eighteenth Book in the Suttanta-Pitaka: Khuddaka-Nikāya‎, Colombo, 2009:

     3 ආක්‍රොශන‍්මාමවොචන‍්මාම ජයන‍්මාමහාපයත්
     අත්‍ර යෙ උපනහ්‍යන‍්තෙ වෛරං තෙෂාං න ශාම්‍යති

     3 Ākrośanmāmavocanmāma jayanmāmahāpayat
     Atra ye upanahyante vairaṃ teṣāṃ na śāmyati.

     They abused me, they reviled me, they defeated me and plundered me.
     Hatred does not subside for those who nurse grudges thus.

     (Wiktionary translation adapted from translation of the Pali by Ajahn Sujato.)

Usually not referring to somewhere as close as इह (ihá, “here”), but still in line of sight.

• Dardic:
  • Kalasha: atrá
• Magadhi Prakrit:
  • Assamese: এতিয়া (etia)
• Maharastri Prakrit: 𑀅𑀢𑁆𑀢 (atta)
  • Konkani: आता (ātā)
  • Old Marathi: आतां (ātāṃ)
    • Marathi: आता (ātā)
• Sauraseni Prakrit: 𑀅𑀢𑁆𑀢 (atta)

From the root अद् (ad, “to eat”).

अत्र • (atra) stem, m

1. a devourer

From the root अद् (ad, “to eat”). Same root as Etymology 2.

अत्र • (atra) stem, n

1. food

• Monier Williams (1899) “अत्र”, in A Sanskrit–English Dictionary, , new edition, Oxford: At the Clarendon Press, →OCLC, page 17/2.
• Otto Böhtlingk, Richard Schmidt (1879-1928) “अत्र”, in Walter Slaje, Jürgen Hanneder, Paul Molitor, Jörg Ritter, editors, Nachtragswörterbuch des Sanskrit [Dictionary of Sanskrit with supplements] (in German), Halle-Wittenberg: Martin-Luther-Universität, published 2016