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Webster's English Dictionary

contact
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.)
4. (Electricity) A metallic conducting component of an electrical device connected to a circuit within and so situated that it may form a conducting pathway to an external power source or device when contacted by another conductor; as, the contact on a standard light bulb has the shape of a screw for easy insertion into the socket. ()
5. A person who serves to commmunicate information to or from one group to another, whether formally or informally; as, a good Washington reporter has contacts in the White House. ()
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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