Clearly showed or proved something by example or explanation; also means to protest publicly.
From Latin demonstrare, combining 'de-' (down/clearly) and 'monstrare' (to show). The word literally means 'to show clearly or point out.'
When scientists 'demonstrate' an experiment, they're showing you proof—but when people 'demonstrate' in the streets, they're literally showing society what they think by their visible presence. Same word, two very different kinds of showing.
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