a

(Roget's IV) modif. & prep.

1. [The indefinite article; before vowels, written ""an'' ]

Syn. some, one, any, each, some kind of, some particular, any of, any one of, a certain.

Ant. the*, this, that.

2. [An indication of frequency]

Syn. per, in a, on a, each, every, to the, by the, at the rate of.