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Use "acervation" in a sentence
"Cold and phlegmatic in their own nature, like damp hay, they heat and inflame by co-acervation; or like bees they become restless and irritable through the increased temperature of collected multitudes."
"'Fanatici-qui circum fana favorem mutuo contrahunt el afflant' -- those who in the same conventicle, or before the same shrine, relique or image, heat and ferment by co-acervation."