Englishfor English speakers
a
Determinative
—
A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
—
A is the first letter of the alphabet.
The letter "a" comes before "b".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
Mio
properNoun
—
An unincorporated community, a census-designated place, the county seat of Oscoda County, Michigan, United States.
agio
—
noun
a fee charged for exchanging currencies