From Wiktionary
a is on the Basic English 850 List.
a - able
a is one of the 1000 most common headwords.
a - able
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Before vowel sounds

  1. (indefinite) (singular) (count) A is used when you don't expect your listener to identify which thing you mean.
    Compare "A book I saw on the shelf" and "The book I gave you yesterday".


  • If the following word starts with a vowel sound, then we use an instead.
  • It is called the indefinite article.
  • It is not used in the plural: a bookbooks but not a books.


A or a

The letter A
  1. A is the first letter of the alphabet.
    The letter "a" comes before "b".
  2. (school) In some schools, an A is a very high grade.
    Ron got an A on his earth science test.

Letters of the Alphabet

A a - B b - C c - D d - E e - F f - G g - H h - I i - J j - K k - L l - M m
N n - O o - P p - Q q - R r - S s - T t - U u - V v - W w - X x - Y y - Z z