D defs.my
Entry 3 senses Webster, 1913

Escapement

/ĭs-kāp'-mənt/ · Es·cape·ment · IPA /ɪˈskeɪpmənt/
01 n. The act of escaping; escape.
  1. 1.
    The act of escaping; escape.[R.]
  2. 2.
    Way of escape; vent.[R.]
    “An escapement for youthful high spirits.” G. Eliot.
  3. 3.
    The contrivance in a timepiece which connects the train of wheel work with the pendulum or balance, giving to the latter the impulse by which it is kept in vibration; -- so called because it allows a tooth to escape from a pallet at each vibration.