Englishfor English speakers
horizontal
Adjective
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Something that is lying down or "straight across" is horizontal. In a horizontal direction means straight across.
The road across the Nullabor plain is horizontal.
Dad hung a swing from a horizontal branch.
Horizontal stripes on a shirt make a person look wider.
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To be horizontal means to have something to do with the horizon.
velocity
Noun
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Something's velocity is how fast it is moving.
The bullet comes out of a gun at a high velocity.
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In science, velocity is how fast something is moving in a particular direction.
The velocity of the car was 10 metres per second to the north-east when it hit the tree.
gradient
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noun
a graded change in the magnitude of some physical quantity or dimension
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noun
the property possessed by a line or surface that departs from the horizontal
a five-degree gradient