permanent axis

noun

Definition of permanent axis

: 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

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“Permanent axis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/permanent%20axis. Accessed 26 Nov. 2020.

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