Or"i*son (?), n. [OF. orison, oreson, oreison, F. oraison, fr. L. oratio speech, prayer. See Oration.]
A prayer; a supplication.
[Poetic]
Chaucer. Shak.
Lowly they bowed, adoring, and began
Their orisons, each morning duly paid.
Milton.
© Webster 1913.