Basic Guidelines For English Spellings
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Highest in position, uppermost; outermost, covering all the rest; farthest away.
Middle English; earliest use found in Statutes of the Realm. Superlative of over. Compare Old High German obarōst, adverb, obarōsto, adjective (Middle High German oberest, adjective, German oberst (adjective) highest, Oberst (noun) superior, colonel).