An ::
An () This word is
properly an
adjective, but is
commonly called the
indefinite article. It is used
before nouns of the
singular number only, and
signifies one, or any, but
somewhat less
emphatically. In such
expressions as twice an hour, once an age, a
shilling an ounce (see 2d A, 2), it has a
distributive force, and is
equivalent to each,
every..