noun 1. the act or state of touching; a touching or meeting, as of two things or people. 2. immediate proximity or ociation. 3. an acquaintance, colleague, or contact metamorphism n. Metamorphism in which the mineralogy and texture of a body of rock are changed by exposure to the pressure and extreme temperature ociated Definition of CONTACT. 1. a: union or junction of surfaces b: the apparent touching or mutual tangency of the limbs of two celestial bodies or of the disk of one body the act or state of touching or meeting: two surfaces in contact; the state or fact of being in touch, communication, or ociation ( with ): to come into contact