masculine or neuter
Āpātha [etymology? Trenckner, Miln page 428 says: "I suspect ā. to be corrupted from āpāta (cf. āpatati), under an impression that it is allied to patha; but it is scarcely ever written so"] — sphere, range, focus, field (of consciousness or perception; cf. BMPE 182 note 2), appearance A II 67; Ja I 336; Vibh 321; Miln 298; Vism 21, 548; Sv I 228; As 308, 333; Vv-a 232 (-kāla); Dhp-a IV 85; Saddh 356. Usually in phrase āpāthaṃ gacchati to come into focus, to become clear, to appear M I 190; S IV 160, or °ṃ āgacchati Vin I 184; A III 377 f.; IV 404; Vism 125. Cf. °gata below. -gata come into the sphere of, appearing, visible M I 174 = Nidd II jhāna (an° unapproached); Pv-a 23 (āpāthaṃ gata); -gatatta abstract from last: appcarance Vism 617.
‘area over which one moves’, region, sphere, range; field of perception
【陽】（感覺器官的）範圍。~gata,【形】 進入範圍的。
(masc, masc, from patha) (of a sense organ) range; sphere; scope; horizon (of) sphere or range (of a sense organ) Construction: ā + √path > pāth + *a