the act or state of touching; a touching or meeting, as of two things or people.
immediate proximity or association.
an acquaintance, colleague, or relative through whom a person can gain access to information, favors, influential people, and the like.
Electricity. a junction of electric conductors, usually metal, that controls current flow, often completing or interrupting a circuit.
Geology. the interface, generally a planar surface, between strata that differ in lithology or age.
Medicine/Medical. a person who has lately been exposed to an infected person.
Sociology. a condition in which two or more individuals or groups are placed in communication with each other. Compare categoric contact, primary contact, secondary contact, sympathetic contact.
verb (used with object)
to put or bring into contact.
to communicate with: We'll contact you by mail or telephone.
verb (used without object)
to enter into or be in contact.
involving or produced by touching or proximity: contact allergy.

1620–30; < Latin contāctus a touching, equivalent to contāc- < *contag-, variant stem of contingere to touch (con- con- + -tingere, combining form of tangere to touch) + -tus suffix of v. action; cf. tango, attain

contactual [kon-tak-choo-uhl] , adjective
contactually, adverb
noncontact, noun, adjective
recontact, noun, verb
uncontacted, adjective

Many verbs in English have derived from nouns. One can head an organization or toe the mark; butter the bread or bread the cutlet. Hence, grammatically at least, there is no historical justification for the once frequently heard criticism of contact used as a verb meaning “to communicate with”: The managing editor contacted each reporter personally. Despite the earlier objections to it and probably largely because there is no other one-word verb in the language to express the same idea, this use of contact has become standard in all types of speech and writing. Contact as a noun meaning “a person through whom one can gain access to information and the like” is also standard: My contact at the embassy says that the coup has been successful.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  the act or state of touching physically
2.  the state or fact of close association or communication (esp in the phrases in contact, make contact)
3.  a.  a junction of two or more electrical conductors
 b.  the part of the conductors that makes the junction
 c.  the part of an electrical device to which such connections are made
4.  an acquaintance, esp one who might be useful in business, as a means of introduction, etc
5.  any person who has been exposed to a contagious disease
6.  photog See contact print
7.  (usually plural) an informal name for contact lens
8.  (modifier) of or relating to irritation or inflammation of the skin caused by touching the causative agent: contact dermatitis
9.  (modifier) denoting an insecticide or herbicide that kills on contact, rather than after ingestion or absorption
10.  (modifier) of or maintaining contact
11.  (modifier) requiring or involving (physical) contact: the contact sport of boxing
vb (when intr, often foll by with)
12.  to put, come, or be in association, touch, or communication
13.  aeronautics (formerly) a call made by the pilot to indicate that an aircraft's ignition is switched on and that the engine is ready for starting by swinging the propeller
[C17: from Latin contactus, from contingere to touch on all sides, pollute, from tangere to touch]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1620s, from L. contactus "a touching," pp. of contingere "to touch, seize," from com- "together" + tangere "to touch" (see tangent). The verb is 1834, "put in contact;" meaning "get in touch with" is 1927, Amer.Eng. As a signal to the person about to spin an aircraft propeller
that the ignition is switched on, the word was in use by 1913. Contact lens is first recorded 1888; short form contact is from 1961.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

contact con·tact (kŏn'tākt')

  1. A coming together or touching, as of bodies or surfaces.

  2. A person recently exposed to a contagious disease, usually through close association with an infected individual.

v. con·tact·ed, con·tact·ing, con·tact·s (kŏn'tākt', kən-tākt')
To bring, be, or come in contact. adj.
  1. Of, sustaining, or making contact.

  2. Caused or transmitted by touching, as a rash.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
contact   (kŏn'tākt')  Pronunciation Key 
  1. Electricity

    1. A connection between two conductors that allows an electric current to flow.

    2. A part or device that makes or breaks a connection in an electrical circuit.

  2. Geology The place where two different types of rock, or rocks of different ages, come together.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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