Noun
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the beginning of a series or sequence
"the Alpha and Omega, the first and the last, the beginning and the end"--Revelations
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the 1st letter of the Greek alphabet
Adjective
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early testing stage of a software or hardware product
"alpha version"
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first in order of importance
"the alpha male in the group of chimpanzees"
"the alpha star in a constellation is the brightest or main star"