ALPHA

noun

1. The name of the first letter of the Greek alphabet (Α, α), followed by beta. In the Latin alphabet it is the predecessor to A.
2. Latin alpha
3. The name of the symbols Α and α used in science and mathematics, often interchangeable with the symbols when used as a prefix.

adjective

1. Designates the first in an order of precedence.
2. (of person, object or action) exhibiting characteristics of the alpha male/female archetype.
3. Designates some bright star, usually the brightest star, of a constellation.