Englishfor English speakers
uppermost
Adjective
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The uppermost point, layer, floor, etc. is the one at the top of something very high.
Birds sat in the uppermost branchs of the tree.
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If something is uppermost in your mind, it's the main thing you're thinking about.
The changes at school were uppermost in her mind.
atmosphere
Noun
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An atmosphere is a layer of gasses that surrounds a planet.
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The atmosphere is the air in a certain place.
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The atmosphere of a place is the mood or feeling of that place.
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An atmosphere is a unit of measurement for pressure.