an act of joining; combining.
the state of being joined; union.
a place or point where two or more things are joined, as a seam or joint.
a place or point where two or more things meet or converge.
a place or station where railroad lines meet, cross, or diverge.
an intersection of streets, highways, or roads.
something that joins other things together: He used the device as a junction between the branch circuit and the main power lines.

1705–15; < Latin junctiōn- (stem of junctiō), equivalent to junct(us), past participle of jungere to join (jung- join + -tus past participle suffix) + -iōn- -ion

junctional, adjective
interjunction, noun

junction, juncture (see synonym study at the current entry).

3. union, linkage, coupling; welt. 7. connection. Junction, juncture refer to a place, line, or point at which two or more things join. A junction is also a place where things come together: the junction of two rivers. A juncture is a line or point at which two bodies are joined, or a point of exigency or crisis in time: the juncture of the head and neck; a critical juncture in a struggle.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
junction (ˈdʒʌŋkʃən)
1.  a place where several routes, lines, or roads meet, link, or cross each other: a railway junction
2.  a point on a motorway where traffic may leave or join it
3.  electronics
 a.  a contact between two different metals or other materials: a thermocouple junction
 b.  a transition region between regions of differing electrical properties in a semiconductor: a p-n junction
4.  a connection between two or more conductors or sections of transmission lines
5.  the act of joining or the state of being joined
[C18: from Latin junctiō a joining, from junctus joined, from jungere to join]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1711, "act of joining," from L. junctionem (nom. junctio), noun of action from jungere "to join" (see jugular). Meaning "place where things meet" first attested 1841, originally in ref. to railroad tracks.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

junction junc·tion (jŭngk'shən)

  1. The act or process of joining or the condition of being joined.

  2. A place where two things join or meet, especially a place where two things come together and one terminates.

  3. A transition layer or boundary between two different materials or between physically different regions in a single material.

junc'tion·al adj.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
All cable connections should be enclosed within a metal junction box.
Creative research and teaching increasingly occur at the junction between
  traditional disciplines.
The junction between an axon and a dendrite is called a synapse.
Power from all the joints is fed down a single umbilical cable to a junction on
  the seabed.
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