Con"tact (?), 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.
© Webster 1913.