ETYM Latin alpha, Greek alpha, from Hebrew âleph, name of the first letter in the alphabet, also meaning ox.
1. The 1st letter of the Greek alphabet.
2. The beginning of a series or sequence.
First letter (A, a) of Greek alphabet. alpha and omega, first and last; entirely; quintessence. alpha particle, positively charged particle, the nucleus of a helium atom. alpha ray, a ray or beam of alpha. particles. alpha wave, variation in frequency of brain waves associated with drowsiness.
In computing, a 64-bit RISC chip launched 1993 by Digital Equipment (DEC). It was seen as a rival to Intel's Pentium chip.

ETYM Latin alphabetum, from Greek alpha + beta, the first two Greek letters; Hebrew âleph and bete: cf. French alphabet.
A character set that includes letters.
Set of conventional symbols used for writing, based on a correlation between individual symbols and spoken sounds, so called from alpha (a) and beta (b), the names of the first two letters of the classical Greek alphabet. The earliest known alphabet is from Palestine, about 1700 BC. Alphabetic writing now takes many forms—for example, the Hebrew aleph-beth and the Arabic script, both written from right to left; the Devanagari script of the Hindus, in which the symbols “hang” from a line common to all the symbols; and the Greek alphabet, with the first clearly delineated vowel symbols.
Each letter of the alphabets descended from Greek represents a particular sound or sounds, usually grouped into vowels (a, e, i, o, u, in the English version of the Roman alphabet), consonants (b, p, d, t, and so on) and semivowels (w, y). Letters may be combined to produce distinct sounds (for example, a and e in words like tale and take, or o and i together to produce a “wa” sound in the French loi), or may have no sound whatsoever (for example, the silent letters gh in high and through).

(Alternate spelling: alphabetisation).
The act of putting in alphabetical order; SYN. alphabetisation.

(Alternate spelling: alphabetise).
To arrange in alphabetical order.

ETYM Cf. French alphabétique.
1. Arranged in order according to the alphabet; SYN. alphabetical.
2. Relating to or expressed by an alphabet; SYN. alphabetical.

See

In alphabetical order.