Englishfor English speakers
a
Determinative
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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
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A is the first letter of the alphabet.
The letter "a" comes before "b".
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In some schools, an A is a very high grade.
Ron got an A on his earth science test.
capo
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noun
the head of a branch of an organized crime syndicate
alto
Noun
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An alto is a vocal range. It is higher than tenor and lower than soprano.
The alto saxophone plays in the alto range.
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An alto is a musical instrument that is higher than a tenor, but is lower than a soprano.
I play the alto flute.
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An alto is a singer who sings in the alto range.