Englishfor English speakers
size
Noun
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How big or small a thing is.
These shirts come in four sizes: small, medium, large, and extra large.
size
Verb
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To measure the size of.
They sized him for a new suit. His shoulders measured 25 inches across.
length
Noun
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The length of an object is the distance between one end of that object and the other.
What is the length of the car?
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The length of a horse is used to show the distance between horses at the end of a race.
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Length is the distance down the pitch that the ball bounces on its way to the batsman.