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mainspring

Definition from Dictionary, a free dictionary
The happiest people are those who think the most interesting thoughts. Those who decide to use leisure as a means of mental development, who love good music, good books, good pictures, good company, good conversation, are the happiest people in the world. And they are not only happy in themselves, they are the cause of happiness in others.
William Lyon Phelps
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English

Noun

Singular
mainspring

Plural
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mainspring ({{{1}}})
  1. The principal spring of a clockwork mechanism, that drives it by uncoiling.
  2. The most important reason for something.
    My daughter is the mainspring of my life.

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