[dis-] prefix [ME dis-, des-, fr. OF & L; OF des-, dis-, fr. L dis-, lit., apart; akin to OE te- apart, L duo two--more at two] 1 a: do the opposite of "disestablish" b: deprive of (a specified quality, rank, or object) "disfranchise" c: exclude or expel from "disbar"
2: opposite or absence of "disunion" "disaffection"
3: not "disagreeable"
4: completely "disannul"
5. [by folk etymology]: dys- "disfunction"