adjective pron
Katara (adjective) [Vedic katara, interrogative pronoun with formation of ordinal number, cf. Greek πύτερος, Latin uter] which one (of a certain number, usually of two) Ja I 4; Pv-a 119. Often only emphatic for ko, e.g. Ja I 298 (kataraṃ upaddavaṃ na kareyya), and used uninflected in compounds, as katara-geha Ja III 9; °gandhaṃ Ja VI 336; °divasaṃ Ja II 251; °nagarato (from what city) Dhp-a I 390; °nāma (kataraṃnāma, adjective) (of what name) ibid. — katarasmiṃ magge in which way, how? Ja IV 110.
katara , pron. adj. (see also katira ; cf. anyatara ; used in this way sometimes in Pali and apparently even in Skt. , where however the cases are rare and not always certain), which (of more than two)?: Divy 102.17 ; 308.8 ; 371.23 kataraḥ (of several) kumāro … rājā bhaviṣyati; Śikṣ 75.4 ; KP 97.4 kataraṃ (cited Śikṣ 233.15 as katarat) cittaṃ; MSV iii.136.10 (read kataraṃ tat), 12. In LV 239.15 (Ārāḍasya dharmo …) na niryāti tat-katarasya samyagduḥkhakṣayāya, and Mv ii.119.5 (nāyaṃ) Ārāḍasya dharmo niryāti tat-katarasya (so mss. ) samyagduḥkhakṣayāye, could at best (but implausibly) be taken to mean Ā. ʼs religion does not result in the complete destruction of the misery of anyone . But Senart emended to tat-karasya, of (for) the one who performs it ( sc. Ā. ʼs religion), which is confirmed by Tib. on LV de byed pa , one who has done that . It is indeed strange to find the same corruption in both texts; but the em. seems quite certain; it is confirmed by Pali takkarassa DN i.235.17 ; MN i.68.12 , in a quite similar phrase; and in a close parallel Mv ii.120.16 one ms. reads tatkarasya (the other corruptly taktenasya).
who? which one? which …?
【形】 哪一個（二中之一）。
katara pron. a. ( °rat n. ) Who or who or which of two; nEtadvidmaH kataraMnno garIyo yadvA jayema yadi vA no jayeyuH Bg. 2. 6.
(adj, adj, interr, from ka) which of the two?; which of the many? which (of a certain number) Construction: ka + tara