late 15c., "easy to do," from French facile "easy," from Latin facilis "easy to do," of persons, "pliant, courteous, yielding," from facere "to do" (from PIE root *dhe- "to set, put"). Usually now with depreciatory implication. Of persons, "easily led," from 1510s.

"opportunities," 1809, plural of facility. Sense of "physical means of doing something" is from 1872.

early 15c., "gentleness, lightness," from Old French facilité "easiness, ease," from Latin facilitatem (nominative facilitas) "easiness, ease, fluency, willingness," from facilis "easy to do," from facere "to do" (from PIE root *dhe- "to set, put"). First in a medical book:

If it be nede forto smyte [the head] wiþ a malle, be it done with esynez or facilite [transl. Guy de Chauliac's "Grande Chirurgie"]

Its sense in English expanded to "opportunity" (1510s), to "aptitude, ease, quality of being easily done" (1530s). Meaning "place for doing something" which makes the word so beloved of journalists and fuzzy writers, first recorded 1872, via notion of "physical means by which (something) can be easily done."

Latin, literally "easily first." An acknowledged leader or chief. See facile, prince.

Latin, literally "the descent of Avernus (is) easy" ["Aeneid," VI.126], in reference to Avernus, a deep lake near Puteoli and a reputed entrance to the underworld; hence, "it is easy to slip into moral ruin."

1610s, "make easy, render less difficult," from French faciliter "to render easy," from stem of Latin facilis "easy to do," from facere "to do" (from PIE root *dhe- "to set, put"). Related: Facilitated; facilitates; facilitating.

1610s, noun of action from facilitate.

1806, agent noun in Latin form from facilitate.

1845, from facilitate + -ive.

"extremely wicked," 1540s, from Latin facinorosus, from stem of facinus "a deed," especially a bad one, from facere "to do" (from PIE root *dhe- "to set, put"). "Very common in 17th c." [OED].