[ al-fuh ]
/ ˈæl fə /
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Origin of alpha

From Latin, from Greek álpha, from Semitic; cf. aleph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use alpha in a sentence

British Dictionary definitions for alpha (1 of 2)

/ (ˈælfə) /

the first letter in the Greek alphabet (Α, α), a vowel transliterated as a
British the highest grade or mark, as in an examination
  1. involving or relating to helium-4 nucleian alpha particle
  2. relating to one of two or more allotropes or crystal structures of a solidalpha iron
  3. relating to one of two or more isomeric forms of a chemical compound, esp one in which a group is attached to the carbon atom to which the principal group is attached
(modifier) denoting the dominant person or animal in a groupthe alpha male

Word Origin for alpha

via Latin from Greek, of Phoenician origin; related to Hebrew āleph, literally: ox

British Dictionary definitions for alpha (2 of 2)

/ (ˈælfə) /

(foll by the genitive case of a specified constellation) usually the brightest star in a constellationAlpha Centauri
communications a code word for the letter a
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for alpha (1 of 2)


The Greek letter alpha. Entries beginning with this character are alphabetized under alpha.
The symbol forBunsen's solubility coefficient
The symbol forspecific rotation

Medical definitions for alpha (2 of 2)

[ ălfə ]

The first letter of the Greek alphabet.
The first one in a series; the beginning.
The first position from a designated carbon atom in an organic molecule at which an atom or radical group may be substituted.
Characterizing the atom or radical group that is closest to the functional group of atoms in an organic molecule.
Relating to one of two or more closely related substances, as in stereoisomers.
Relating to or characterizing a polypeptide chain that is one of five types of heavy chains present in immunoglobins.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.