α (EN)

letter, symbol

letter “α”

1. the first letter of the Greek alphabet, alpha
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   In Greek, the word "ἀγάπη" (agape) begins with α.

symbol “α”

1. (mathematics) a variable often used to represent an angle
   In geometry, angle α is opposite side a.
2. (physics) a symbol used to denote the coefficient of thermal expansion
   The engineer calculated the expansion using α in the formula.
3. (astronomy) right ascension, a coordinate in the sky
   The astronomer recorded the star's α and declination.