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Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  alpha(noun) the 1st letter of the Greek alphabet. 2  alpha(adj) the beginning of a series or sequence. the Alpha and Omega, the first and the last, the beginning and the end--Revelations. 3  alpha(adj) first in order of importance.
The letter alpha represents various concepts in physics and chemistry, including alpha radiation, angular acceleration, alpha particles, alpha carbon and strength of electromagnetic interaction (as Fine-structure constant).