Definition from Wiktionary, the free dictionary
|Unicode name||GREEK SMALL LETTER ALPHA|
|Greek and Coptic||U+03B1|
- (electrodynamics) The fine structure constant.
- (classical mechanics) Represents angular acceleration.
- See Wikipedia article on angular acceleration for usage.
- (chemistry) Used in chemical nomenclature.
- α-lactam has a three-membered ring structure.
- (astronomy) Used to identify the brightest star in a constellation, for instance α-Centauri.
Derived terms 
See also 
See alpha for names of this symbol in other languages.
α (a) (lower case, upper case Α)
- Lower-case άλφα (álfa, “alpha”), the first letter of the modern Greek alphabet. Represents the open front unrounded vowel: IPA: /a/, X-SAMPA: /A/.
Usage notes 
Ancient Greek, however, did not distinguish between upper case and lower case. See Α (A) for details.