Englishfor English speakers
depression
Noun
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A depression is when a person's feelings are very sad and unhappy.
Van Gogh suffered from depression for a long time before he killed himself.
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A depression is a low point on a surface.
There was a small depression in the ground where the rock had been.
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A depression is when the economy slows down by a lot.
The business community is worried that the oil problems could lead to a depression.
groundwater
noun
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Water existing beneath the earth's surface in underground streams and aquifers
level
Adjective
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Even, flat, straight, smooth, horizontal. Having all parts equally as high as all other parts.
This table is not level: things are rolling off it.
level
Noun
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A level is a place that is higher or lower than some other places.
The room you want is on the third level of this building.
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A tool for finding out whether a surface is level.