• adjective
• synonym
• antonym

• perpetual calendar (noun)
  1. a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years
• perpetual motion (noun)
  1. the ability of a machine to always continue moving without getting energy from anywhere else, which is not considered possible
• perpetual motion machine (noun)
  1. a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy
• perpetual warrant (noun)
  1. a warrant with no expiration date
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