Strong's #1: a (pronounced al'-fah)

of Hebrew origin; the first letter of the alphabet; figuratively, only (from its use as a numeral) the first: --Alpha. Often used (usually an, before a vowel) also in composition (as a contraction from 427) in the sense of privation; so, in many words, beginning with this letter; occasionally in the sense of union (as a contraction of 260).

Thayer's Greek Lexicon:

a

1) first letter of Greek alphabet

2) Christ is the Alpha to indicate that he is the beginning and the end

Part of Speech: letter

Relation: of Hebrew origin

Usage:

This word is used 4 times:

 

Revelation 1:8: "I am Alpha and Omega, the beginning"
Revelation 1:11: "Saying, I am Alpha and Omega,"
Revelation 21:6: "It is done. I am Alpha and Omega,"
Revelation 22:13: "I am Alpha and Omega, the beginning and the end,"