Webster's English Dictionary

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pendulum

pen.du.lum \'pen-j*-l*m, -dy*-l*m, -d*l-*m\ n [NL, fr. L, neut. of 
   pendulus] often attrib  : a body suspended from a fixed point so as to 
   swing freely to and fro und er the action of gravity and commonly used to 
   regulate the movements of clockwork and other machinery