brain gainn. [after brain drainn.] colloquial the immigration of highly trained or qualified people, regarded as beneficial to a country's economy or society.
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1964 Times 18 Feb. 1/7 (advt.) This week ‘Engineering’..reviews the brain gain as well as the brain drain.
2009 T. E. Williams et al. Coming Shortage of Surgeons iv. 50 What has happened in these 35 years or so has been a brain gain on the part of American medicine.