Main Entry: ¹a

Pronunciation: \ˈā\

Function: noun

Inflected Form(s): plural a's or as \ˈāz\

Usage: often capitalized often attributive

Date: before 12th century

1 a : the 1st letter of the English alphabet b : a graphic representation of this letter c : a speech counterpart of orthographic a
2 : the sixth tone of a C-major scale
3 : a graphic device for reproducing the letter a
4 : one designated a especially as the first in order or class
5 a : a grade rating a student's work as superior in quality b : one graded or rated with an A
6 : something shaped like the letter A
7 capitalized : the one of the four ABO blood groups characterized by the presence of antigens designated by the letter A and by the presence of antibodies against the antigens present in the B blood group