Aa
A / ei / noun
[ count, noncount ] ( plural A's, a's / eiz / )
the first letter of the English alphabet "Apple" begins with an "A."
A the highest grade given for a test or piece of work I got an A on my chemistry exam.
а Ф / э ; ei / ( also an / эп ; жп / ) article
one or any
Would you like a drink? A dog has four legs. He's a teacher.
each, or for each
She calls her mother three times a week. The salary is $45,000 a year. Which word?
