Plural of agreation; rare or obsolete instances of bringing things into mutual agreement.
From agreation + -s (plural marker). This would follow standard English pluralization if 'agreation' existed as a productive term.
Plural forms of rare words can be even rarer than the singular—you might find 'agreation' in one historical text, but 'agreations' probably exists only in theoretical discussions of word formation or in this very database!
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