A lever



  • A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; — used for transmitting and modifying force and motion.
  • A small such piece to trigger or control a mechanical device (like a button).
  • A bar, as a capstan bar, applied to a rotatory piece to turn it.
  • An arm on a rock shaft, to give motion to the shaft or to obtain motion from it.
  • A crowbar.
  • A levee.




  • , from Latin levātor, from levō; see levant. Compare alleviate, elevate, leaven.
  • From Middle English lever, comparative of leve, leef, equivalent to lief + -er. Related to German lieber.
  • Borrowed from French lever.

Modern English dictionary

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