"alpha" in the noun sense
1. alpha
the 1st letter of the Greek alphabet
2. alpha
the beginning of a series or sequence
"the Alpha and Omega, the first and the last, the beginning and the end"
"alpha" in the adjective sense
1. alpha
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"
2. alpha
early testing stage of a software or hardware product
"alpha version"
Source: WordNet® (An amazing lexical database of English)
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