perpendicular
adjective
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extremely steep“the great perpendicular face of the cliff”sharp
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at right angles to the plane of the horizon or a base linevertical
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intersecting at or forming right angles“the axes are perpendicular to each other”
noun
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an extremely steep face
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a cord from which a metal weight is suspended pointing directly to the earth's center of gravityplumb line
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a Gothic style in 14th and 15th century Englandperpendicular style
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a straight line at right angles to another line