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.
media
Noun
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The (mass) media is/are the news sources and the people behind them.
The media have been too accepting of the government's arguments.
The Japanese media often ignores international news.
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A medium is a way of information or art.
We have to use music, pictures and other media to sell the product.