1a or A 
/ˈeɪ/ noun
plural a's or as or A's or As /ˈeɪ/ noun 1 : the first letter of the English alphabet [count] ▪ a word that begins with an a [noncount] ▪ a word that begins with a 2 : a musical note or key referred to by the letter A : the sixth tone of a C-major scale [count] ▪ play/sing an A [noncount] ▪ a song in the key of A 3 [count] : a grade that is given to a student for doing excellent work
▪ She got an A on the exam. ▪ He's an A student. [=a student who gets A's for his schoolwork] 4 [noncount] — used to refer to the first of two or more people, places, or things that are being considered ▪ If A, B, and C divide the coins equally, how many does each person get?
▪ She got an A on the exam. ▪ He's an A student. [=a student who gets A's for his schoolwork]
an A for effort — see effort
exhibit A — see 2exhibit
from A to Z
: including everything
▪ The book is titled “Home Repairs From A to Z.”
▪ The book is titled “Home Repairs From A to Z.”
from (point) A to (point) B
: from one place to another
▪ I don't care about the scenery. I'm only interested in getting from A to B.
▪ I don't care about the scenery. I'm only interested in getting from A to B.
