noun main·spring \ˈmān-ˌspriŋ\

: the most important spring in a watch or clock

: the most important or powerful cause or part of something

Full Definition of MAINSPRING

:  the chief spring in a mechanism especially of a watch or clock
:  the chief or most powerful motive, agent, or cause

Examples of MAINSPRING

  1. Agriculture is the mainspring of their economy.

First Known Use of MAINSPRING

MAINSPRING Defined for Kids


noun main·spring \ˈmān-ˌspriŋ\

Definition of MAINSPRING for Kids

:  the principal spring in a mechanical device (as a watch or clock)


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