Top Definition
A word formed by the combination of momentum and inertia. It has the combined meaning of both. Used to refer to bodies in motion. Extreem speed and weight are fators in whether a person or an object has monertia.
He had serious monertia when he hit the wall.

Monertia is a thrill seeker's worst friend.
by Buzzy Groves March 09, 2009
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