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backcourt |
in tennis, the part of the court between the base line and the service line. (Cf. forecourt.) [1/3 definitions] |
foot fault |
in tennis, a violation caused if both feet are not behind the base line when one is serving. |
triangulation |
a system used by navigators and surveyors to calculate the distance between two points, or the relative position of points on a plane, in which each known point is made the vertex of a triangle and each triangle is given a base line of known length. [1/2 definitions] |
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