CONTACT

contact. Contact, n. a touch, juncture, very close union

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Con″tact (kŏn″tăkt), n. [[L. contactus, fr. contingere, -tactum, to touch on all sides. See Contingent.]] 1. 1. A close union or junction of bodies; a touching or meeting.
2. 2. (Geom.) The property of two curves, or surfaces, which meet, and at the point of meeting have a common direction.
3. 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.