Lexical Definition

‎Α‎ A (al'-fah) Alpha ^G:N-LI
of Hebrew origin

--Alpha.

• the first letter of the alphabet
• figuratively, only (from its use as a numeral) the first:

Abbott-Smith

Α, α, ἄλφα (q.v.), τό, indecl.,
alpha, the first letter of the Greek alphabet. As a numeral, αʹ = 1, α͵ = 1000. As a prefix, it appears to have at least two and perhaps three distinct senses:
1. ἀ- (before a vowel, ἀν-) negative, as in ἄ-γνωστος, ἄ-δικος.
2. ἀ-, ἁ- copulative, indicating community and fellowship, as in ἁ-πλοῦς, ἀ-κολουθέω, ἀ-δελφός.
3. An intensive force (LS, s. α), as in ἀ-τενίζω is sometimes assumed (but v. Boisacq, s.v.).

Liddell-Scott-Jones

α, Ἀλφα, τό,

indeclinable (plural τὰ ἄ.[Refs 4th c.BC+], see A a [near the start];[α, Ἀλφα συλλαβὴν γνῶναι 3rd c.BC: Herodas Mimographus 3.22. ">Refs 5th c.BC+]

__2 T-square, [Refs]
__3 Phoenician for βοὸς κεφαλή, [Refs 5th c.AD+]
__4 metaphorically, τὸ α, Ἀλφα καὶ τὸ ὦ the first and last, [NT]

_{LSJ Scripture Refs: Rev.1.8}