Bible Dictionaries
Mainspring
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Mainspring'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/m/mainspring.html. 1828.