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The Collaborative International Dictionary
Coemption

Coemption \Co*emp"tion\ (?; 215), n. [L. co["e]mptio, fr. co["e]mere to buy up. See Emption.] The act of buying the whole quantity of any commodity. [R.]
--Bacon. [1913 Webster] ||

Wiktionary
coemption

n. 1 The buying of the entire supply of a commodity 2 A form of civil marriage (in Roman law) in which a fictitious sale of the man and wife took place