Alpha

Boyd’s Bible Dictionary:

First letter of the Greek alphabet. Used with omega, the last letter, to express beginning and end (Isa. 41:4; 44:6⁴Who hath wrought and done it, calling the generations from the beginning? I the Lord, the first, and with the last; I am he. (Isaiah 41:4)
⁶Thus saith the Lord the King of Israel, and his redeemer the Lord of hosts; I am the first, and I am the last; and beside me there is no God. (Isaiah 44:6); Rev. 1:8,11; 21:6; 22:13⁸I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty. (Revelation 1:8)
¹¹Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea. (Revelation 1:11)
⁶And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely. (Revelation 21:6)
¹³I am Alpha and Omega, the beginning and the end, the first and the last. (Revelation 22:13)).

“Alpha” From Concise Bible Dictionary:

The first letter of the Greek Alphabet, and which also signifies the numeral 1. A title or character of God and of Christ, which points to His eternity as “the beginning,” “the first,” the I AM (Rev. 1:8⁸I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty. (Revelation 1:8); Rev. 21:6⁶And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely. (Revelation 21:6); Rev. 22:13¹³I am Alpha and Omega, the beginning and the end, the first and the last. (Revelation 22:13)). “I am Alpha and Omega, the beginning and the end,” or “the first and the last”; which is similar to a passage in Isaiah 41:4: “I Jehovah, the first, and with the last; I am He.”

“A א (Aleph)” From Concise Bible Dictionary:

Aleph is the first letter in the Hebrew alphabet. In numerals it stands for 1, and with two points, א, 1,000. A (alpha) the first letter in the Greek alphabet. The small letter with a dash after (α´), stands for 1. (For this letter as a name of Christ see ALPHA.)

Strong’s Dictionary of Greek Words:

Number:

1 (find all occurrences in KJV Bible)

Greek:

Phonic:

al’-fah

Meaning:

of Hebrew origin; the first letter of the alphabet; figuratively, only (from its use as a numeral) the first: --Alpha. Often used (usually ἄν, 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).

Jackson’s Dictionary of Scripture Proper Names:

first letter of the Greek alphabet: beginning