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.
generation
Noun
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A generation, is all the people or things of about the same age.
My father belonged to a generation of travellers who saw the world before there was a McDonalds on every corner.
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A generation is the average time between one when group of people were born and when their children were born, roughly 20–30 years.
During previous generations, travel was not so easy.
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A class or type of objects usually developed from an earlier type.
A new generation of personal computers is about to hit the stores.
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Generation is the creation of something, often electricity.
The increase in new power generation has not kept up with demand for electricity.