Arranged in alphabetical order; organized or arranged according to the sequence of the alphabet.
From 'alphabet' + the suffix '-ed' (past participle form, used as an adjective). The term describes something that has been processed or organized by alphabetical sequence.
A 'well-alphabeted library' in the 1500s was mind-blowing technology—putting books in ABC order meant you could actually find things instead of wandering around hoping to stumble upon the right volume.
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