Englishfor English speakers
millennium
Noun
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A millennium is a period of time lasting one thousand years.
Mankind invented the first writing systems a few millennia ago.
Lots of animal species have disappeared during the last millennium.
round
Preposition
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If mathx/math is round mathy/math, mathy/math is in the middle and mathx/math is on all sides.
Everyone stood round the fire to keep warm.
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If you turn or look round, you are now facing the opposite direction.
She turned round to see what had made the noise.
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You round up numbers in math
You round 28 up to 30.
round
Adjective
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Something is round if it's like a circle or like part of a circle. It is curved, not straight.