Etymology
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money-lender (n.)

"one who lends money on interest," 1765, from money + lender.

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buy-in (n.)
"act of obtaining an interest in," 1970, from verbal phrase buy in "to purchase a commission or stock" (1826), from buy (v.) + in (adv.). To buy into "obtain an interest in by purchase" (as of stock shares) is recorded from 1680s.
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newsworthy (adj.)

"of interest to the general public," 1932, from news (n.) + worthy (adj.). Related: Newsworthiness.

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uninteresting (adj.)
"not capable of exciting interest," 1769, from un- (1) "not" + interesting.
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self-serving (adj.)

"serving one's own (selfish) interest over other considerations," 1827, from self- + serving, present-participle adjective from serve (v.).

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altruistic (adj.)
"having regard for the interest and well-being of others," 1853, from altruist + -ic. Related: Altruistically.
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funded (adj.)
1776, "existing in the form of interest-bearing bonds," past-participle adjective from fund (v.).
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associate (n.)
1530s, "a partner in interest or business," from associate (adj.). Meaning "one admitted to a subordinate degree of membership" is from 1812.
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public-mindedness (n.)

"disposition to promote the public interest, public spirit," 1690s, from public (adj.) in the sense of "directed to the interests of the community at large."

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coupon (n.)
Origin and meaning of coupon

1822, "certificate of interest due on a bond" (a piece which could be cut from the bond and presented for payment), from French coupon, literally "piece cut off," from couper "to cut," from coup "a blow" (see coup). Meaning widened to "discount ticket" 1860s by British travel agent Thomas Cook. The specific advertising sense "ticket or document that can be redeemed for a financial discount or rebate when purchasing a product" is by 1906.

COUPON. A financial term, which, together with the practice, is borrowed from France. In the United States, the certificates of State stocks drawing interest are accompanied by coupons, which are small tickets attached to the certificates. At each term when the interest falls due, one of these coupons is cut off (whence the name); and this being presented to the State treasurer or to a bank designated by him, entitles the holder to receive the interest. [Bartlett]
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