The Collaborative International Dictionary
Emption
Emption \Emp"tion\, n. [L. emptio, fr. emere to buy.]
The act of buying. [R.]
--Arbuthnot.
Douglas Harper's Etymology Dictionary
emption
late 15c., "purchase," from Latin emptionem (nominative emptio) "a buying, purchasing; thing bought," noun of action from past participle stem of emere "to buy" (see exempt (adj.)).
Wiktionary
emption
n. The act of buying.