What is the meaning of alpha?

noun

• The 1st letter of the Greek alphabet.
• The beginning of a series or sequence. "the Alpha and Omega, the first and the last, the beginning and the end-Revelations

adjective

• First in order of importance.
  • usage: "the alpha male in the group of chimpanzees"; "the alpha star in a constellation is the brightest or main star"
• Early testing stage of a software or hardware product.
  • usage: "alpha version"