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We found 20 dictionaries with English definitions that include the word perpetual motion: Click on the first link on a line below to go directly to a page where "perpetual motion" is defined. General (16 matching dictionaries) perpetual motion: American Heritage Dictionary of the English Language [home, info] perpetual motion: Collins English Dictionary [home, info] perpetual motion: Vocabulary.com [home, info] perpetual-motion, perpetual motion: Wordnik [home, info] perpetual motion: Wiktionary [home, info] perpetual motion: Compact Oxford English Dictionary [home, info] perpetual motion: The Wordsmyth English Dictionary-Thesaurus [home, info] perpetual motion: Infoplease Dictionary [home, info] Perpetual motion, perpetual motion: Dictionary.com [home, info] Perpetual Motion (album), Perpetual Motion (film), Perpetual Motion (short story), Perpetual Motion (solitaire), Perpetual Motion, Perpetual-motion, Perpetual motion (disambiguation): Wikipedia, the Free Encyclopedia [home, info] perpetual motion: Rhymezone [home, info] Perpetual Motion: 1911 edition of the Encyclopedia Britannica [home, info] perpetual motion: Free Dictionary [home, info] perpetual motion: Mnemonic Dictionary [home, info] perpetual motion: LookWAYup Translating Dictionary/Thesaurus [home, info] perpetual motion: Dictionary/thesaurus [home, info] Computing (1 matching dictionary) Perpetual-motion, Perpetual motion: Encyclopedia [home, info] Miscellaneous (1 matching dictionary) Perpetual Motion: Brilliant Dream Dictionary [home, info] Slang (1 matching dictionary) perpetual motion: Urban Dictionary [home, info] Tech (1 matching dictionary) Perpetual motion: AUTOMOTIVE TERMS [home, info]

Quick definitions from WordNet (perpetual motion) ▸ noun:  motion that continues indefinitely without any external source of energy; impossible in practice because of friction