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Alpha
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alphabet

al·pha·bet [ álfə bèt ] (plural al·pha·bets)


noun 
Definition:
 
1. letters used to represent language: a set of letters, usually listed in a fixed order, used in writing a language and representing its basic speech sounds
the Cyrillic alphabet

2. symbols for communicating: a set of symbols representing units used in communication, especially speech sounds or words
the alphabet in Braille

3. basic principles: the basic principles of something ( formal )

[Early 16th century. Via late Latin alphabetum< Greek alphabētos< Greek alpha and bēta, the first and second letters of the alphabet]
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