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.
deduction
Noun
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Deduction is the process or result of thinking about information to find an answer or opinion.
A detective must uncover the murderer by logical deduction from facts.
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Deduction is the amount or process of taking something away, usually money.
The average worker takes home about $500 per week after tax and other deductions.