Etymology
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inveterate (adj.)
late 14c., "old," from Latin inveteratus "of long standing, chronic, old," past participle of inveterare "become old in," from in- "in, into" (from PIE root *en "in") + verb from vetus (genitive veteris) "old" (see veteran). From early 15c. as "firmly established by long continuance;" from c. 1500, of persons, "hardened, confirmed" (in habit, etc.). Related: Inveterateness.
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inveteracy (n.)
"long continuance," 1690s, from inveterate + abstract noun suffix -cy.
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confirmed (adj.)

late 14c., of diseases, "firmly established," past-participle adjective from confirm. From mid-15c. as "supported by authority or proof." Of persons, "established in the habit, inveterate," from 1826.

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sandwich (n.)

1762, said to be a reference to John Montagu (1718-1792), 4th Earl of Sandwich, who was said to be an inveterate gambler who ate slices of cold meat between bread at the gaming table during marathon sessions rather than rising for a proper meal (this account of the origin dates to 1770).

It also was in his honor that Cook named the Hawaiian islands (1778) when Montagu was first lord of the Admiralty (hence the occasional 19c. British Sandwicher for "a Hawaiian"). The family name is from the place in Kent, one of the Cinque Ports, Old English Sandwicæ, literally "sandy harbor (or trading center)." For pronunciation, see cabbage. Sandwich board, one before and one behind the carrier, is from 1864.

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