Etymology
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agreement (n.)

c. 1400, "mutual understanding" (among persons), also (of things) "mutual conformity," from Old French agrement, agreement, noun of action from agreer "to please" (see agree). Attested in English by early 15c. as "formal or documentary agreement, terms of settlement."

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sales 

"of or pertaining to sale, sales, or the business of selling," word-forming element from genitive of sale (n.), by 1520s, in salesman. Cf. saleswork "work done for sale" (1775). For earlier use of similar formations, compare craftsman, oarsman, both Middle English. Sales tax is attested by 1886; sales clerk by 1863; sales associate by 1946. Sales representative is from 1910.

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salesman (n.)

"one whose occupation is the selling of goods, services, or merchandise," 1520s, from man (n.) + sales (q.v.), genitive of sale (n.). Compare craftsman, tradesman.

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high-pressure (adj.)

1824, of engines, from high (adj.) + pressure (n.). Of weather systems from 1891; of sales pitches from 1933.

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pitchman (n.)

1926, American English, from pitch (n.1) in the sales sense + man (n.).

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compact (n.1)

"an agreement or contract between two or more parties," 1590s, from Latin compactum "agreement," noun use of neuter past participle of compacisci "come to agreement," from com "with, together" (see com-) + pacisci "to covenant, contract" (from PIE root *pag- "to fasten").

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Concorde (n.)

supersonic passenger airliner operating from 1976 to 2003, from French concorde, literally "harmony, agreement" (see concord (n.)), reflecting the Anglo-French collaborative agreement that produced it.

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follow-up (n.)

1905, originally in the argot of sales and business, from verbal phrase follow up "pursue closely, act on energetically" (1794); see follow (v.) + up (adv.).

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zydeco (n.)

1949, perhaps from Creole French pronunciation of French les haricots "the beans," part of the title of a popular dance tune ("les haricots sont pas salés").

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GATT 

1947, acronym from General Agreement on Tariffs and Trade.

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