Etymology
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alphabetical (adj.)

"pertaining to an alphabet; in the order of the alphabet," 1560s, from alphabet + -ical. Alphabetary (adj.) also is from 1560s; alphabetic is from 1640s. Related: Alphabetically.

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Definitions of alphabetical

alphabetical (adj.)
relating to or expressed by a writing system that uses an alphabet;
alphabetical writing system
Synonyms: alphabetic
alphabetical (adj.)
arranged in order according to the alphabet;
dictionaries list words in alphabetical order
Synonyms: alphabetic
From wordnet.princeton.edu