an
an · article
Definitions
article
- 1.
The form of the indefinite article used before words beginning with a vowel sound.
- 2.
Used to indicate a single but unspecified person or thing.
- 3.
Used to indicate membership of a class or profession.
- 4.
Used to express rates or ratios.
Related words
Etymology
From Old English ān ("one"), the same origin as "one." The form "an" was originally used before all words but was later reduced to "a" before consonant sounds.