Strong's G1 — α (noun)
a (al'-fah) n.
1. the first letter of the alphabet
2. (figuratively) only
3. (numerically) the first
4. (prefix, commonly) not, without (a-, an-, i.e. amoral, anarchy)
5. (prefix, occasionally) in the sense of a union (i.e. akin, adelphos "brother")
{Often used as a prefix in composition in the sense of privation (as a contraction from G427); occasionally in the sense of union (as a contraction of G260)}
[of Hebrew origin]
KJV: Alpha 
Compare: G427, G260