apacaya : [m.] falling off; diminution; unmaking.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Apacaya [fr. apa + ci] falling off, diminution (opp. ācaya gathering, heaping up), unmaking, esp. loss (of wordliness), decrease (of possibility of rebirth Vin ii.2 = iii.21 = iv.213; cp. J iii.342; S ii.95 (kāyassa ācayo pi apacayo pi); A iv.280 = Vin ii.259 (opp. ācaya); J iii.342 (sekho ˚ena na tappati); Vbh 106, 319, 326, 330.

Pali-English Dictionary, TW Rhys Davids, William Stede,

apacaya([apa離]+[caya積聚]): m. 離

巴漢辭典 編者：(斗六) 廖文燦