1550s, "darkness of meaning, obscurity," from French opacité, from Latin opacitatem (nominative opacitas) "shade, shadiness," from opacus "shaded, dark, opaque," a word of unknown origin. The literal sense "condition of being impervious to light; quality of a body which renders it impervious to rays of light" in English is recorded from 1630s.
word-forming element meaning "a making or causing," from Latin -ficationem (nominative -ficatio), forming nouns of action from verbs in -ficare (compare -fy), combining form of facere "to make," from PIE root *dhe- "to set, put."
<a href="https://www.etymonline.com/word/opafication">Etymology of opafication by etymonline</a>
Harper, D. (n.d.). Etymology of opafication. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/opafication