sopāna : [m.; nt.] stairs; a ladder.

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

Sopāna (m. and nt.) [cp. Sk. sopāna; Aufrecht "sa+ upāyana"] stairs, staircase Vin ii.117, 152; D ii.178; J i.330, 348; iv.265; Vism 10; VvA 188; PvA 156, 275; Vv 785; dhura -- sopāna the highest step of a staircase (?) J i.330.
   -- kalingara flight of steps Vin ii.128 (v. l. sopāṇakaḷevara as at M ii.92). -- panti a flight or row of steps, a ladder Vism 392 (three). -- pāda the foot of the steps (opp. ˚sīsa) DhA i.115. -- phalaka a step of a staircase J i.330.

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

【陽、中】 樓梯，梯。~panti,【陰】 階梯的一段。~pāda,【陽】 梯腳。~phalaka,【中】 梯級。~sīsa,【中】 梯頭（樓梯的頂端）。

A Chinese Translation of A.P. Buddhadatta Concise Pali-English Dictionary

sopāna n. (perhaps contracted fr. sa + upâyana) stairs, steps, a staircase, ladder to (gen. or comp.) MBh. Kāv. &c

Sanskrit-English Dictionary, by M. Monier William