"a bargain," early 13c., cheffare "buying and selling," also (14c.) cheapfare, probably from Old English ceap "bargain, traffic, gain, sale" (see cheap) + faru "faring, going" (see fare (n.)). In later use, "haggling." The verb is recorded from mid-14c. as "to trade, buy and sell," from 1725 as "to haggle."
late 14c., "expound the meaning of, render clear or explicit," from Old French interpreter "explain; translate" (13c.) and directly from Latin interpretari "explain, expound, understand," from interpres "agent, translator," from inter "between" (see inter-) + second element probably from PIE *per- (5) "to traffic in, sell." Related: Interpreted; interpreting.
also deaccession, "remove an entry for an item from the register of a museum, library, etc." (often a euphemism for "to sell"), by 1968, from de- "off, away" + accession, which had been used since 1887 in library publications as a verb meaning "to add to a catalogue." Related: De-accessioned; de-accessioning.
1530s, "exclusive control of a commodity or trade," from Latin monopolium, from Greek monopōlion "right of exclusive sale," from monos "single, alone" (from PIE root *men- (4) "small, isolated") + pōlein "to sell," from PIE root *pel- (4) "to sell."
Alternative form monopole (1540s, from the Old French form of the word) was common in 16c. Meaning "possession of anything to the exclusion of others" is by 1640s; sense of "a company or corporation which enjoys a monopoly" is by 1871. The popular board game, developed in its final version by Charles Darrow (1889-1967) and marketed by Parker Brothers, is from 1935, the year it was a craze. Monopoly money "unreal currency" is attested by 1959, in reference to the paper used in the game.