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.
definition
Noun
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A definition is an explanation of the meaning of a word.
The sentence before this one is a definition.
ESL students often check definitions in their dictionaries.
Can you give me a definition for "imprisonment"?