mainspring

[ meyn-spring ]

noun

1. the principal spring in a mechanism, as in a watch.
2. the chief motive power; the impelling cause.

mainspring

/ ˈmeɪnˌsprɪŋ /

noun

1. the principal power spring of a mechanism, esp in a watch or clock
2. the chief cause or motive of something

Word History and Origins

Origin of mainspring¹

First recorded in 1585–95; main ¹ + spring

Example Sentences

The outer end of the mainspring is attached to the rim of the barrel, and the inner end to the barrel arbor.

From Project Gutenberg

Unless this double mainspring is known, the conduct of Catherine de' Medici will remain forever misunderstood.

From Project Gutenberg

To such religion was the mainspring which kept the whole intellect going; and religion was to be had at the meeting.

From Project Gutenberg

All the old restraints were wanting, and self-interest alone formed the mainspring of action.

From Project Gutenberg

Fingering is the mainspring, the determining principle, one might almost say the life and soul, of the pianoforte technique.

From Project Gutenberg

Related Words

• aim
• cause
• consideration
• emotion
• feeling
• idea
• impulse
• influence
• intent
• intention
• motivation
• passion
• rationale