Etymology
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banker (n.)
"keeper of a bank," 1530s, agent noun formed from bank (n.1), possibly modeled on French banquier (16c.).
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banking (n.)
"the business of a banker," 1735, verbal noun from bank (v.1).
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bank (v.1)
"to act as a banker," 1727, from bank (n.1). As "to deposit in a bank" from 1833. Figurative sense of "to rely on" (i.e. "to put money on") is from 1884, U.S. colloquial. Related: Banked; banking; bankable.
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tontine (n.)
1765, from French tontine, named for Lorenzo Tonti, Neapolitan banker in Paris who in 1653 first proposed this method of raising money in France.
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bunker (n.)
1758, originally Scottish, "seat, bench," a word of uncertain origin, possibly a variant of banker "bench" (1670s; see bank (n.2)); or possibly from a Scandinavian source (compare Old Swedish bunke "boards used to protect the cargo of a ship"). Meaning "receptacle for coal aboard a ship" is from 1839. Of sand-holes on golf courses, by 1824, from the extended sense "earthen seat" (1805). The meaning "dug-out fortification" probably is from World War I.
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negotiation (n.)

early 15c., negotiacioun, "a dealing with people, trafficking," from Old French negociacion "business, trade," and directly from Latin negotiationem (nominative negotiatio) "business, traffic," noun of action from past participle stem of negotiari "carry on business, do business, act as a banker," from negotium "a business, employment, occupation, affair (public or private)," also "difficulty, pains, trouble, labor," literally "lack of leisure," from neg- "not" (from PIE root *ne- "not") + otium "ease, leisure," a word of unknown origin.

The sense expansion from "doing business" to also include "bargaining" about anything took place in Latin. Meaning "mutual discussion and arrangement of the terms of a transaction or agreement" is from 1570s.

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clearing-house (n.)

also clearinghouse, 1805, from clearing + house (n.). The original was established 1775 in London by the bankers for the adjustment of their mutual claims for checks and bills; later the word was extended to similar institutions.

CLEARING, is a method adopted by city bankers, for exchanging the drafts on each others houses, and settling the differences.—Thus at a stated hour in the afternoon, a clerk from each attends at the Clearing House, where he brings all the drafts on the other bankers, which have been paid into his house during the course of the day; and, having debited their different accounts with the articles which he has against them, he deposits them in their proper drawers, (a drawer being here allotted to each banker:) he then credits their accounts respectively, with the articles which they have against him, as found in his drawer. Balances are then struck on all the accounts, and the differences are transferred from one to another, until they are so wound up, that each clerk has only to settle with two or three others, which is done in cash, or Bank of England notes. [P. Kelly, "The Elements of Book-Keeping," London, 1805]
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