Etymology
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off-Broadway (adj.)

1953 in reference to experimental theater productions in New York City, from off (prep.) + Broadway. Even more experimental off-off-Broadway is attested by 1958.

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piano (adv.)

musical instruction, "softly, with little force or loudness," 1680s, from Italian piano, which is ultimately is from Latin planus "flat, smooth, even," later "soft" (from PIE root *pele- (2) "flat; to spread").

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humbug (n.)
1751, student slang, "trick, jest, hoax, imposition, deception," of unknown origin. Also appearing as a verb at the same time, "deceive by false pretext" (trans.). A vogue word of the early 1750s; its origin was a subject of much whimsical speculation even then. "[A]s with other and more recent words of similar introduction, the facts as to its origin appear to have been lost, even before the word became common enough to excite attention" [OED]. Meaning "spirit of deception or imposition; hollowness, sham" is from 1825.
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rubber (n.2)

"deciding match" in a game or contest, usually a third where each has won one, 1590s, a word of unknown origin and signification; even the original form is uncertain. Not obviously connected to rubber (n.1). 

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equiparation (n.)
mid-15c., "impartial treatment;" 1610s, "equal ranking;" from Latin aequiparationem (nominative aequiparatio) "an equalizing, comparison," from past participle stem of aequiparare "put on equality, compare," from aequipar "equal, alike," from aequus "equal, even" (see equal (adj.)) + par (see par (n.)). Related: Equiparate.
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Planaria (n.)

flat worm-like animal, 1819, from Modern Latin (1776) noun use of fem. of Late Latin planarius, literally "on level ground" (here used to mean "flat"), from Latin planum, planus "flat, level, even, plain" (from PIE root *pele- (2) "flat; to spread"). Related: Planarian.

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equal (adj.)
late 14c., "identical in amount, extent, or portion;" early 15c., "even or smooth of surface," from Latin aequalis "uniform, identical, equal," from aequus "level, even, flat; as tall as, on a level with; friendly, kind, just, fair, equitable, impartial; proportionate; calm, tranquil," which is of unknown origin. Parallel formation egal (from Old French egal) was in use late 14c.-17c. Equal rights is from 1752; by 1854 in American English in reference to men and women. Equal opportunity (adj.) in terms of hiring, etc. is recorded by 1925.
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pianissimo (adv.)

musical instruction, "with the minimum of force or loudness," 1724, from Italian pianissimo "very softly," superlative of piano, which is ultimately is from Latin planus "flat, smooth, even," later "soft" (from PIE root *pele- (2) "flat; to spread").

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alright 

frequent spelling of all right, attested in print by 1884.

There are no such forms as all-right, or allright, or alright, though even the last, if seldom allowed by the compositors to appear in print, is often seen ... in MS. [Fowler]
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aroint (v.)
intransitive verb, c. 1600, used by Shakespeare (only in imperative, aroint thee! "begone!"), obsolete and of obscure origin. "[T]he subject of numerous conjectures, none of which can be said to have even a prima facie probability." [OED]
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