Englishfor English speakers
day
Noun
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A day is a measure of time.
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24 hours
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Seven days make one week
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The time between midnight and the following midnight (or between sunset and sunset in Jewish reckoning)
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The time between sunrise and sunset, when it is daylight
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The part of a day spent at work or school
He spent two days at work means that on two days he went to work; he did not spend 48 hours at work.
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.