What does alphabetic or alphabetical mean?
The definition of alphabetic and alphabetical
Al`pha*bet”ic, Al`pha*bet”ic*al, a.
Etym: [Cf. F. alphabétique.]

1 Pertaining to, furnished with, expressed by, or in the order of, the letters of the alphabet; as, alphabetic characters, writing, languages, arrangement.
2 Literal. [Obs.] “Alphabetical servility.” Milton.