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1. The act of demonstrating; an exhibition; proof; especially, proof beyond the possibility of doubt; indubitable evidence, to the senses or reason. 2. An expression, as of the feelings, by outward signs; a manifestation; a show. 3. The exhibition and explanation of a dissection or other anatomical preparation. 4. (Mil.) a decisive exhibition of force, or a movement indicating an attack. 5. The act of proving by the syllogistic process, or the proof itself. 6. A course of reasoning showing that a certain result is a necessary consequence of assumed premises; -- these premises being definitions, axioms, and previously established propositions. 7. a show or display; the act of presenting something to sight or view; "the presentation of new data"; "he gave the customer a demonstration"
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