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Con"tact (kn"tkt), n.[L. contactus, fr. contingere, -tactum, to touch on all sides. See Contingent.] 1. A close union or junction of bodies; a touching or meeting. 2. (Geom.) The property of two curves, or surfaces, which meet, and at the point of meeting have a common direction. 3. (Mining) The plane between two adjacent bodies of dissimilar rock. Raymond. Contact level, a delicate level so pivoted as to tilt when two parts of a measuring apparatus come into contact with each other; -- used in precise determinations of lengths and in the accurate graduation of instruments.
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