Meaning of '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

A,

, it has a distributive force, and is equivalent to each, every. Note: An is used before a word beginning with a vowel sound; as, an enemy, an hour. It in also often used before h sounded, when the accent of the word falls on the second syllable; as, an historian, an hyena, an heroic deed. Many writers use a before h in such positions. Anciently an was used before consonants as well as vowels. If; -- a word used by old English authors. Shak. Nay, an thou dalliest, then I am thy foe. B. Jonson. An if, and if; if.