Upadhāna (adj. nt.) [fr. upa + dhā, cp. upadahati] "putting under", i. e. (1) a pillow, cushion D i.7; S ii.267 = Miln 366 (kaḷingar˚); S iii.145; A i.137, 181; iii.50, J iv.201; v.506 (tamb˚ = ratt˚ C.); (2) imposing, giving, causing Dh 291 dukkh˚).

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

upa-dhā́na mfn. placing upon, employed or used in placing upon (as a Mantra in the setting up of the sacrificial bricks) Pāṇ. 4-4, 125

• (am), n. the act of placing or resting upon KātyŚr. Kauś

• that on which one rests, a pillow, cushion AV. xiv, 2, 65 ŚBr. KātyŚr. MBh. Suśr. &c

• cover, lid Car. Hcat

• peculiarity, singularity, excellence (cf. premôpa○) Bālar. Siddh

• affection, kindness

• religious observance

• poison L

• (ī), f. a pillow, cushion

• footstool ( pādôpa○) MBh

Sanskrit-English Dictionary, by M. Monier William