From WordNet (r) 2.0 (August 2003) [wn]:
junction
n 1: the place where two or more things come together
2: the state of being joined together [syn: conjunction,
conjugation, colligation]
3: the shape or manner in which things come together and a
connection is made [syn: articulation, join, joint,
juncture]
4: something that joins or connects [syn: conjunction]
5: an act of joining or adjoining things [syn: adjunction]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Junction \Junc"tion\, n. [L. junctio, fr. jungere, junctum, to
join: cf. F. jonction. See Join.]
[1913 Webster]
1. The act of joining, or the state of being joined; union;
combination; coalition; as, the junction of two armies or
detachments; the junction of paths.
[1913 Webster]
2. The place or point of union, meeting, or junction;
specifically, the place where two or more lines of railway
meet or cross.
[1913 Webster]
Junction plate (Boilers), a covering or break-join plate
riveted to and uniting the edges of sheets which make a
butt joint.
Junction rails (Railroads), the switch, or movable, rails,
connecting one line of track with another.
[1913 Webster]