How does the word sound?
"An" is used instead of "a" when the following word starts with a vowel sound. Vowel sounds are the sounds of the letters a, e, i, o, u.
A modification of the meaning of the next word and indicates the whole group referred to by the word. Created to expand on meaning of words and can modify a large number of words.
Examples of how the word is used
|A fish swims below the surface of the water.|
|A dog has four legs.|