The state or quality of disagreeing; lack of agreement or harmony.
From disagree + -ance (suffix forming nouns from verbs). An archaic or rare term, largely replaced by the more common 'disagreement' in modern English.
Disagreeance is almost forgotten—the word 'disagreement' was more efficient and squeezed it out, which shows how languages are ruthless about eliminating redundant words, like natural selection but for vocabulary.
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