Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
out-migration is a noun meaning "migration from a place (especially migration from your native country in order to settle in another)". It carries one recorded sense.
migration from a place (especially migration from your native country in order to settle in another)
Definitions, synonyms and semantic relations for out-migration come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.