escapement

escapement is a   Noun

Definition:

[1] The act of escaping; escape. [R.]

[2] Way of escape; vent. [R.] An escapement for youthful high spirits. G. Eliot.

[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.

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