Definition of mainspring Mainspring

main•spring

We found 5 definitions of mainspring from 4 different sources.

What does mainspring mean?

Plural: mainsprings

mainspring - the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism

spring a metal elastic device that returns to its shape or position when pushed or pulled or pressed; "the spring was broken"

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mainspring (Noun)
The principal spring of a clockwork mechanism, that drives it by uncoiling.
mainspring (Noun)
The most important reason for something.

mainspring (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.