Englishfor English speakers
extension
Noun
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The space that something occupies.
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Extension is the process of making something longer.
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An extension is the time or part of something that was added to make it longer.
She had extensions put in her hair and now she has long hair.
He couldn't pay in May so the bank gave him an extension until July.
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An extension is the operation of pulling the two ends of a broken bone to bring the broken pieces into the same straight line.
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Extension is the act of moving an arm, leg, finger, etc. so that it is straight.
number
Noun
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A symbol that that is used to describe quantity; a numeral.
2, 5589, and 0 are all numbers.
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A few.
She has a number of dictionaries--four or five, I think.
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A musical, theatrical, or literary selection or production.
She chose a number from "Swan Lake" for her dance recital.
number
Verb
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To label objects with numbers.
Number the baskets so that we can find them easily.
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To total or count; to amount to.
I don’t know how many books are in the library, but they must number in the thousands.