| perpendicular: | Vertical (straight up and down) or at right angles to a given surface. The fence was perpendicular to the ground. The sideline and baseline of a tennis court are perpendicular to one another. | |
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| perpendicular: | Vertical (straight up and down) or at right angles to a given surface. The fence was perpendicular to the ground. The sideline and baseline of a tennis court are perpendicular to one another. | |
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