An archaic past participle of 'eat,' meaning having consumed food; the old form of eaten.
From Old English 'etan' (to eat). The past participle form 'eeten' was common in Middle English but was eventually regularized to the modern 'eaten' by the 1600s.
You'd hear 'he hath eeten his fill' in old English—notice how the form looks almost like 'eaten' but with the historical '-en' ending that used to mark past participles before English simplified!
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