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mainspring: Meaning and Definition of

main•spring

Pronunciation: (mān'spring"), [key]
— n.
  1. the principal spring in a mechanism, as in a watch.
  2. the chief motive power; the impelling cause.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
mainsheet mainstay
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