Etymology
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monarchy (n.)

mid-14c., monarchie, "a kingdom, territory ruled by a monarch;" late 14c., "rule by one person with supreme power;" from Old French monarchie "sovereignty, absolute power" (13c.), from Late Latin monarchia, from Greek monarkhia "absolute rule," literally "ruling of one," from monos "alone" (from PIE root *men- (4) "small, isolated") + arkhein "to rule" (see archon). Meaning "form of government in which supreme power is in the hands of a monarch" is from early 15c.

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absolute (adj.)
Origin and meaning of absolute

late 14c., "unrestricted, free from limitation; complete, perfect, free from imperfection;" also "not relative to something else" (mid-15c.), from Latin absolutus, past participle of absolvere "to set free, acquit; complete, bring to an end; make separate," from ab "off, away from" (see ab-) + solvere "to loosen, untie, release, detach," from PIE *se-lu-, from reflexive pronoun *s(w)e- (see idiom) + root *leu- "to loosen, divide, cut apart."

Sense evolution probably was from "detached, disengaged" to "perfect, pure." Meaning "despotic" (1610s) is from notion of "absolute in position;" absolute monarchy is recorded from 1735 (absolute king is recorded from 1610s). Grammatical sense is from late 14c.

Absolute magnitude (1902) is the brightness a star would have at a distance of 10 parsecs (or 32.6 light years); scientific absolute value is from 1907. As a noun in metaphysics, the absolute "that which is unconditional or free from restriction; the non-relative" is from 1809.

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absolute zero (n.)

"lowest possible temperature which the nature of heat admits" (determined to be –273 centigrade, –458 Fahrenheit), the idea dates back to 1702 and its general value was guessed to within a few degrees soon thereafter, but not precisely discovered until Lord Kelvin's work in 1848. It was known by many names, such as infinite cold, absolute cold, natural zero of temperature; the term absolute zero was among them by 1806.

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monarchist (n.)

"advocate for or believer in monarchy," 1640s, from monarchy + -ist. Related: Monarchistic.

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monarchism (n.)

"the principle of monarchical government; preference for monarchy," by 1791, from French monarchisme, from monarchie (see monarchy).

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autarchy (n.)

1660s, "absolute sovereignty," from Latinized form of Greek autarkhia, from autarkhein "to be an absolute ruler," from autos "self" (see auto-) + arkhein "to rule" (see archon).

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plutarchy (n.)

"plutocracy," 1640s, from Greek ploutos "wealth" (see Pluto) + -archy "rule" on model of monarchy, etc.

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bigness (n.)

"largeness of proportions; size, whether large or small; bulk, absolute or relative," late 15c., from big + -ness.

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dictator (n.)
Origin and meaning of dictator

late 14c., dictatour, "Roman chief magistrate with absolute authority," from Old French dictator and directly from Latin dictator, agent noun from dictare "say often, prescribe," frequentative of dicere "to say, speak" (from PIE root *deik- "to show," also "pronounce solemnly").

In Latin, a dictator was a judge in the Roman republic temporarily invested with absolute power; this historical sense was the original one in English. The transferred sense of "absolute ruler, person possessing unlimited powers of government" is from c. 1600; that of "one who has absolute power or authority" of any kind, in any sphere is from 1590s. 

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void (n.)

1610s, "unfilled space, gap," from void (adj.). Meaning "absolute empty space, vacuum" is from 1727.

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