Etymology
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alpha (n.)

c. 1300, from Latin alpha, from Greek alpha, from Hebrew or Phoenician aleph (see aleph). The Greeks added -a because Greek words cannot end in most consonants. Sense of "beginning of anything" is from late 14c., often paired with omega (the last letter in the Greek alphabet, representing "the end"); sense of "first in a sequence" is from 1620s. In astronomy, the designation of the brightest star of each constellation (the use of Greek letters in star names began with Bayer's atlas in 1603). Alpha male was in use by c. 1960 among scientists studying animals; applied to humans in society from c. 1992.

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Definitions of alpha
1
alpha (n.)
the 1st letter of the Greek alphabet;
alpha (n.)
the beginning of a series or sequence; "the Alpha and Omega, the first and the last, the beginning and the end"--Revelations;
2
alpha (adj.)
first in order of importance;
the alpha star in a constellation is the brightest or main star
the alpha male in the group of chimpanzees
alpha (adj.)
early testing stage of a software or hardware product;
alpha version
From wordnet.princeton.edu