word-forming element meaning "not, opposite of, without" (also im-, il-, ir- by assimilation of -n- with following consonant, a tendency which began in later Latin), from Latin in- "not," cognate with Greek an-, Old English un-, all from PIE root *ne- "not."
In Old French and Middle English often en-, but most of these forms have not survived in Modern English, and the few that do (enemy, for instance) no longer are felt as negative. The rule of thumb in English has been to use in- with obviously Latin elements, un- with native or nativized ones.
1704, in a now-obsolete sense "law which makes a criminal process civil," from civil + -ization. Sense of "civilized condition, state of being reclaimed from the rudeness of savage life" first recorded 1772, probably from French civilisation, serving as an opposite to barbarity and a distinct word from civility. From civilize + -ation. Sense of "a particular human society in a civilized condition, considered as a whole over time," is from 1857. Related: Civilizational.
<a href="https://www.etymonline.com/word/incivilization">Etymology of incivilization by etymonline</a>
Harper, D. (n.d.). Etymology of incivilization. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/incivilization