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Explanation: The name of the first letter of the Greek alphabet. The begining of anything. The name assigned to the brightest star in each constellation followed by the constellation's name, as Alpha Centauri. Etc. Perhaps, more context is required.
Explanation: much like the other person said: first letter of Greek alphabet; "a" if you will; first; primary. Many times there are galaxies and stars found in the same general region or cluster, so they would call the first one discovered "Alpha ---" and the second "Beta ---" .