IPA: /ˌæləˈbɛtɪkəl/
KK: /ˌæl.əˈbɛt.ɪ.kəl/
Arranged in the order of the letters of the alphabet, from A to Z.
The books on the shelf are organized in alphabetical order.
Alphabetical → It is formed from "alpha" (the first letter of the Greek alphabet) and "bet" (from the Greek "beta", the second letter of the alphabet) combined with the suffix "-ical" (meaning pertaining to). The word "alphabetical" refers to something that is related to the order of letters in the alphabet.
Think of the first two letters of the Greek alphabet, 'alpha' and 'beta', to remember that 'alphabetical' relates to the order of letters.