The difference between Interchange and Outerchange
When used as nouns, interchange means an act of interchanging, whereas outerchange means a connection between two stations within walking distance of each other but which are not physically connected.
Interchange is also verb with the meaning: to switch (each of two things).
check bellow for the other definitions of Interchange and Outerchange
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Interchange as a verb (transitive):
to switch (each of two things)
Examples:
"to interchange places"
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Interchange as a verb (transitive):
to mutually give and receive (something); to exchange
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Interchange as a verb (intransitive):
to swap or change places
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Interchange as a verb (transitive):
to alternate; to intermingle or vary
Examples:
"to interchange cares with pleasures"
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Interchange as a noun:
An act of interchanging.
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Interchange as a noun:
A highway junction in which traffic may change from one road to another without crossing a stream of traffic.
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Interchange as a noun (rail transport):
A connection between two or more lines, services or modes of transport; a station at which such a connection can be made.
Examples:
"Holborn tube station is the only interchange between the London Underground Central and Piccadilly Lines"
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Outerchange as a noun (British, chiefly, London, rail transport):
A connection between two stations within walking distance of each other but which are not physically connected; used especially where a journey involving such a connection can be done on a single ticket.
Examples:
"The five minute walk between Northwick Park and Kenton tube stations is a valid outerchange."