Deadbeat \Dead"beat`\, a. (Physics) Making a beat without recoil; giving indications by a single beat or excursion; -- said of galvanometers and other instruments in which the needle or index moves to the extent of its deflection and stops with little or no further oscillation.

Deadbeat escapement. See under Escapement.

Source: Webster's Revised Unabridged Dictionary (1913)