One of the mysteries of the English language finally explained.
The combining of two or more things into a single entity; union, combination.
Mid 16th century; earliest use found in Thomas Cranmer (1489–1556), archbishop of Canterbury. From post-classical Latin adunation-, adunatio mystical union, (of people) meeting, gathering from adunat-, past participial stem of adunare to unite + classical Latin -iō. In recent use after French (rare) adunation.
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