The act of crying out against something; loud protest or declamation against something.
From dis- (not, against) + clamation (from Latin clamatio, from clamare 'to cry out'). This is a rare word combining dis- with the root that gives us 'declamation' and 'exclamation,' referring to vociferous protest.
This word is so obscure that most dictionaries barely mention it, sitting in the shadowy space between 'declamation' (passionate speech) and 'exclamation' (a shout), but it beautifully captures the idea of shouting *against* something.
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