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The Collaborative International Dictionary
Intermigration

Intermigration \In`ter*mi*gra"tion\, n. Reciprocal migration; interchange of dwelling place by migration. [R.]
--Sir M. Hale.

Wiktionary
intermigration

n. reciprocal migration; interchange of dwelling place by migration

Usage examples of "intermigration".

And to this continuity of the circumpolar land, and to the consequent freedom for intermigration under a more favourable climate, I attribute the necessary amount of uniformity in the sub-arctic and northern temperate productions of the Old and New Worlds, at a period anterior to the Glacial epoch.