Wordnet 3.0
NOUN (1)
1.
migration from a place (especially migration from your native country in order to settle in another);
[syn: emigration, out-migration, expatriation]
The Collaborative International Dictionary of English v.0.48:
out-migration \out-migration\ n.
migration out of country or territory; emigration.
Syn: emigration.
[WordNet 1.5]
WordNet (r) 3.0 (2006):
out-migration
n 1: migration from a place (especially migration from your
native country in order to settle in another) [syn:
emigration, out-migration, expatriation]