Dictionary![]() ![]() mump•si•musPronunciation: (mump'su-mus), [key] —n., —pl. -mus•es for 2. 1. adherence to or persistence in an erroneous use of language, memorization, practice, belief, etc., out of habit or obstinacy (opposed to sumpsimus). 2. a person who persists in a mistaken expression or practice (opposed to sumpsimus). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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