Etymology
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firm (n.)
"business house," 1744, according to Barnhart from German Firma "a business, name of a business," originally "signature," from Italian firma "signature," from firmare "to sign," from Latin firmare "make firm, affirm," in Late Latin, "confirm (by signature)," from firmus "strong; stable," figuratively "constant, trusty" (see firm (adj.)).
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dealership (n.)

"the business of an authorized trader," 1916, from dealer + -ship.

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leisure (adj.)
"free from business, idle, unoccupied," 1660s, from leisure (n.).
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banking (n.)
"the business of a banker," 1735, verbal noun from bank (v.1).
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actuarial (adj.)
"of the business of an actuary," 1853, from actuary + -al (1). Related: Actuarially.
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cc 

also c.c., 1936 as abbreviation of carbon-copy in business correspondence.

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rat-catcher (n.)

"one whose business is the catching of rats, a ratter," 1590s, from rat (n.) + catcher.

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marketing (n.)

1560s, "buying and selling, act of transacting business in a market," verbal noun from market (v.). Meaning "produce bought or sold at a market" is from 1701. The business sense, "process of moving goods from producer to consumer with emphasis on advertising and sales," is attested by 1897.

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whale (v.1)
"pursue the business of whale-fishing," 1700, from whale (n.). Whale-fishing is attested from 1570s.
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railroading (n.)

1841, "business of making or running railways;" 1842, "travel by rail," from railroad (n.).

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