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Webster 1913 Edition

Noun.

[L.

commigratio

Migration together.

[R.]

Woodward.

Noun.

The moving of a body of people from one country or place to another with a view to permanent residence.

commigration ‎(countable and uncountable, plural commigrations)

Migration together.
(Can we find and add a quotation of Woodward to this entry?)