permanent axis

noun

: the axis about which a free rigid body can rotate in equilibrium being in general the axis of greatest moment of inertia through the center of mass compare principal axis

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now