alpha

al·pha \ ˈal-fə \

άλφα, álpha

Α, α

[noun]

  1. the first letter of the Greek alphabet
  2. the first version of a product that is being developed and tested
  3. the first of a series, the beginning
  4. the brightest start in a constellation
  5. the mathematical estimate of the return on a security when the return on the market as a whole is zero
  6. the return on an investment portfolio that can be attributed to the skill of the portfolio’s manager rather than the performance of the market

 

[adjective]

  1. having the most power in a group of animals or people
  2. closest in position in the structure of an organic molecule to a particular group or atom; also, occuring at or having a structure characterized by such a position

 

From the Merriam-Webster and TheFreeDictionary.com dictionaries.