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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.
LA
Abbreviation
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Louisiana, a state of the United States of America.
I live in Baton Rouge, LA.
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Lao People's Democratic Republic, a member state of the United Nations.
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Lampung, a province of Indonesia.
LA
Initialism
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Los Angeles, a city in the state of California in the United States.
We went to LA for the summer.
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Lead arsenate, a pesticide introduced in the United States in 1892, mostly replaced by DDT in the late 1940s, and banned in 1988.