The version as unrevolutionary act

un- (1) 

prefix of negation, Old English un-, from Proto-Germanic *un- (cognates: Old Saxon, Old Frisian, Old High German, German un-, Gothic un-, Dutch on-), from PIE *n- (source of Sanskrit a-, an- "not," Greek a-, an-, Old Irish an-, Latin in-), comb. form of PIE root *ne "not" (cognates: Avestan na, Old Church Slavonic and Lithuanian ne "not," Latin ne "that not," Greek ne- "not," Old Irish ni, Cornish ny "not"). Often euphemistic (such as untruth for "lie").

The most prolific of English prefixes, freely and widely used in Old English, where it forms more than 1,000 compounds. It underwent a mass extinction in early Middle English, but emerged with renewed vigor 16c. to form compounds with native and imported words. It disputes with Latin-derived cognate in- (1) the right to form the negation of certain words (indigestable/undigestable, etc.), and though both might be deployed in cooperation to indicate shades of meaning (unfamous/infamous), typically they are not.

It also makes words from phrases (such as uncalled-for, c. 1600; undreamed-of, 1630s; uncome-at-able, 1690s; unputdownable, 1947, of a book; un-in-one-breath-utterable, Ben Jonson; etc., but the habit is not restricted to un-; such as put-up-able-with, 1812). As a prefix in telegramese to replace not and save the cost of a word, it is attested by 1936.

1774; see revolution + -ary. As a noun, from 1850 (cf revolutionist).

revolution (n.) 

late 14c., originally of celestial bodies, from Old French revolucion "course, revolution (of celestial bodies)" (13c.), or directly from Late Latin revolutionem (nominative revolutio) "a revolving," noun of action from past participle stem of Latin revolvere "turn, roll back" (see revolve).

General sense of "instance of great change in affairs" is recorded from mid-15c. Political meaning "overthrow of an established political system" first recorded c. 1600, derived from French, and was especially applied to the expulsion of the Stuart dynasty under James II in 1688 and transfer of sovereignty to William and Mary.

revolve (v.) 

late 14c., "to change direction, bend around, turn (the eyes) back," from Old French revolver and directly from Latin revolvere "roll back, unroll, unwind; happen again, return; go over, repeat," from re- "back, again" (see re-) + volvere "to roll" (see volvox). In 15c., "to turn over (in the mind or heart), meditate." Meaning "travel around a central point" first recorded 1660s (earlier "cause to travel in an orbit around a central point," mid-15c.). Related: Revolved; revolving.

volvox (n.) 

genus of fresh-water algae, 1798, from Latin volvere "to roll," from PIE root *wel- (3) "to turn, revolve," with derivatives referring to curved, enclosing objects (cognates: Sanskrit valate"turns round," ulvam "womb, vulva;" Lithuanian valtis "twine, net," vilnis "wave," apvalus "round;" Old Church Slavonic valiti "roll, welter," vlŭna "wave;" Greek eluo "wind, wrap," helix "spiral object," eilein "to turn, squeeze;" Gothic walwjan "to roll;" Old English wealwian "roll," weoloc "whelk, spiral-shelled mollusk;" Old High German walzan "to roll, waltz;" Old Irish fulumain "rolling;" Welsh olwyn "wheel"). So called from their motion.

version (n.) 

1580s, "a translation," from Middle French version, from Medieval Latin versionem (nominative versio) "a turning, a translation," from past participle stem of Latin vertere "to turn, change, alter, translate" (see versus). Also with a Middle English sense of "destruction;" the meaning "particular form of a description" is first attested 1788.

versus (prep.) 

mid-15c., in legal case names, denoting action of one party against another, from Latin versus "turned toward or against," from past participle of vertere (frequentative versare) "to turn, turn back, be turned, convert, transform, translate, be changed," from PIE *wert- "to turn, wind," from root *wer- (3) "to turn, bend" (cognates: Old English -weard "toward," originally "turned toward," weorthan "to befall," wyrd "fate, destiny," literally "what befalls one;" Sanskrit vartate "turns round, rolls;" Avestan varet- "to turn;" Old Church Slavonic vrŭteti "to turn, roll," Russian vreteno "spindle, distaff;" Lithuanian ver čiu "to turn;" Greek rhatane "stirrer, ladle;" German werden, Old English weorðan "to become" (for sense, compare turn into); Welsh gwerthyd "spindle, distaff;" Old Irish frith "against").