dis·miss / disˈmis/ • v. [tr.] order or allow to leave; send away: she dismissed the taxi at the corner of the road. ∎  discharge from employment or office: CBS Records dismissed another 120 people. ∎  treat as unworthy of serious consideration: it would be easy to dismiss him as all brawn and no brain. ∎  deliberately cease to think about: he suspected a double meaning in her words, but dismissed the thought. ∎  [intr.] (of a group assembled under someone's authority) disperse: he told his company to dismiss. ∎  Law refuse further hearing to (a case): the judge dismissed the case for lack of evidence. ∎  (in sports) defeat or end an opponent’s turn.DERIVATIVES: dis·miss·al / -əl/ n.dis·miss·i·ble adj.

dismiss XV. First in pp., repr. OF. desmis (mod. démis) :- medL. dismissus, for L. dīmissus, pp. of dīmittere, f. DIS- 1 + mittere send.
So dismission XVI; after F. †desmission (mod. dé-); largely repl. by dismissal XIX.