Con"tact (kŏn"tăkt),
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.