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What is another word for mainspring?

Need synonyms for mainspring? Here's a list of similar words from our thesaurus that you can use instead.

(figuratively) The most important reason, motive or cause for something
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“In Murphy's account, the mainspring of Douglas's public career was his aching, but never fulfilled, ambition for the presidency.”
An important quality or feature on which a particular thing depends or is based
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A coiled shape or device
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