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Webster 1913 Edition

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Noun.

[See

The state of being between; a coming or lying between or among; intervention; also, that which lies between.

England and Scotland is divided only by the

interjacency

of the Tweed.

Sir M. Hale.

Noun.

[L. interjacens; inter and jacens, lying.]

A lying between; a being between; intervention; as the interjacency of the Tweed between England and Scotland.

That which lies between. [Little used.]

interjacency ‎(uncountable)

The quality of being interjacent.
Something that lies between.
England and Scotland is divided only by the interjacency of the Tweed. — Sir M. Hale.