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Dictionary

perpet'ual mo'tion

Mech.
the motion of a theoretical mechanism that, without any losses due to friction or other forms of dissipation of energy, would continue to operate indefinitely at the same rate without any external energy being applied to it.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

perpetual check

perpetuate

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