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say it: mahy-GRAY-shuhn
migration is a noun meaning "the movement of persons from one country or locality to another". It carries 4 recorded senses.
the movement of persons from one country or locality to another
a group of people migrating together (especially in some given time period)
(chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule
chemistry
the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for migration come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.