perpetual motion
21perpetual motion — per.petual motion n [U] the ability of a machine to always continue moving without getting energy from anywhere else, which is not considered possible …
22perpetual motion — noun the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear …
23perpetual motion — perpet′ual mo′tion n. mec 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 …
24perpetual motion — /pəpɛtʃuəl ˈmoʊʃən/ (say puhpechoohuhl mohshuhn) noun 1. the motion of a theoretical machine that would continue to operate forever without receiving any energy from outside. 2. Music a rapid and brilliant piece of music with many repetitions.… …
25History of perpetual motion machines — The history of perpetual motion machines dates back to the Middle Ages. For millennia, it was not clear whether perpetual motion devices were possible or not, but the development of modern thermodynamics has indicated that they are impossible.… …
26perpetual motion machine — a device which will turn forever because there is no friction between the moving part and the stationary part. Although friction can be greatly reduced, it can never be eliminated …
27perpetual motion machine — noun a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy • Hypernyms: ↑machine * * * noun : a device inherently impossible under the law of… …
28Motion — Mo tion, n. [F., fr. L. motio, fr. movere, motum, to move. See {Move}.] 1. The act, process, or state of changing place or position; movement; the passing of a body from one place or position to another, whether voluntary or involuntary; opposed… …
29Motion block — Motion Mo tion, n. [F., fr. L. motio, fr. movere, motum, to move. See {Move}.] 1. The act, process, or state of changing place or position; movement; the passing of a body from one place or position to another, whether voluntary or involuntary;… …
30Perpetual — Per*pet u*al, a. [OE. perpetuel, F. perp[ e]tuel, fr. L. perpetualis, fr. perpetuus continuing throughout, continuous, fr. perpes, etis, lasting throughout.] Neverceasing; continuing forever or for an unlimited time; unfailing; everlasting;… …
