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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
alpha al·pha (āl'fə)
n.
Symbol α 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.