Etymology
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dateline (n.)

also date-line, 1880 as an imaginary line down the Pacific Ocean on which the calendar day begins and ends, from date (n.1) + line (n.). Never set by any treaty or international organization, it is an informal construct meant to coincide with a line 180 degrees (12 hours) from Greenwich, but it always has followed a more or less crooked course.

Meaning "line of text that tells the date and place of origin of a newspaper, article, telegram, etc." is by 1888.

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materialization (n.)

also materialisation, 1822, "act of investing with or assuming a material form; a change from a spiritual, ideal, or imaginary state to a state of matter," noun of action from materialize. In spiritualism, "the assumption (by a spirit) of a bodily form," by 1875.

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skyhook (n.)

also sky-hook, "imaginary device to hold things up," 1915, originally aviators' jargon, from sky (n.) + hook (n.). Applied from 1935 to actual device for lifting things into the air.

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witticism (n.)

1670s, coined by Dryden (as wittycism) from witty on model of criticism.

"That every witticism is an inexact thought: that what is perfectly true is imperfectly witty ...." [Walter Savage Landor, "Imaginary Conversations"]
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MYOB 

also m.y.o.b., by 1846, American English slang, an abbreviation of mind your own business. Often in M.Y.O.B. Society, an imaginary organization which a too-inquisitive person would be invited to join.

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agonic (adj.)

"having no angle," 1846, from Greek agōnos, from a- "not" (see a- (3)) + -gōnos "angled," from gōnia "angle, corner" (from PIE root *genu- (1) "knee; angle"). In reference to the imaginary line on the earth's surface connecting points where the magnetic declination is zero.

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dystopia (n.)

"imaginary bad place," 1952, from dys- "bad, abnormal" + ending abstracted from utopia. Earlier in medical use, "displacement of an organ" (by 1844), with second element from Greek topos "place" (see topos). Dystopian was used in the non-medical sense in 1868 by J.S. Mill:

I may be permitted, as one who, in common with many of my betters, have been subjected to the charge of being Utopian, to congratulate the Government on having joined that goodly company. It is, perhaps, too complimentary to call them Utopians, they ought rather to be called dys-topians, cacotopians. What is commonly called Utopian is something too good to be practicable; but what they appear favour is too bad to be practicable. [speech, March 12, 1868]
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utopia (n.)

1551, from Modern Latin Utopia, literally "nowhere," coined by Thomas More (and used as title of his book, 1516, about an imaginary island enjoying the utmost perfection in legal, social, and political systems), from Greek ou "not" + topos "place" (see topos). The current (since c. 1960) explanation of Greek ou "not" is an odd one, as it derives the word from the PIE root *aiw- "vital force, life; long life, eternity." Linguists presume a pre-Greek phrase *(ne) hoiu (kwid) "(not on your) life," with ne "not" + *kwid, an "emphasizing particle" [Watkins]. The same pattern is found elsewhere.

Extended to any perfect place by 1610s. Commonly, but incorrectly, taken as from Greek eu- "good" (see eu-) an error reinforced by the introduction of dystopia (by 1844). On the same model, Bentham had cacotopia (1818).

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circumduction (n.)

"the moving of a limb, etc., around an imaginary axis," 1570s, from Latin circumductionem (nominative circumductio), noun of action from past-participle stem of circumducere "to lead around, move or drive around," from circum "around" (see circum-) + ducere "to lead" (from PIE root *deuk- "to lead"). Related: Circumduce.

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unmerited (adj.)

1640s, from un- (1) "not" + past participle of merit (v.).

"An ingenuous mind feels in unmerited praise the bitterest reproof. If you reject it you are unhappy, if you accept it you are undone." [Walter Savage Landor, "Imaginary Conversations"]
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