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Definition of: notion
(nō′shən) noun
1. A mental apprehension; an idea.
2. Loosely, an opinion; a hastily formed theory.
3. Intention; inclination.
4. plural U.S. Miscellaneous, small, useful articles, such as ribbons, thread, pins, needles, hairpins, etc. See synonyms under IDEA, THOUGHT1. [<L notio, -onis <noscere know]
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