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Definition of Mainspring
1. Noun. The most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism.
Definition of Mainspring
1. n. The principal or most important spring in a piece of mechanism, especially the moving spring of a watch or clock or the spring in a gunlock which impels the hammer. Hence: The chief or most powerful motive; the efficient cause of action.
Definition of Mainspring
1. [n -S]
Lexicographical Neighbors of Mainspring
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