Englishfor English speakers
building
Noun
—
A building consists of walls, a foundation and a roof that together close in some space.
I work in the Chrysler Building.
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.
nest
Noun
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The home a bird builds for itself.
—
The home or bedding of some other animals.
The mother wolf built a nest in her den before she had her cubs.
nest
Verb
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When an animal builds or stays in its nest, especially when taking care of its babies there.
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If somethings is nested in something else, it is inside it. Usually, this is used for several things, with the second thing in the first thing, the third things in the second thing—for however many things are nested. This is often used in computer programming.
The computer program had nested for loops, that looked like this: