a. The portion of the head which is the primary center for the regulation and control of bodily activities, receiving and interpreting sensory impulses, and transmitting information to the muscles and body organs. It is also the seat of consciousness, thought, memory, and emotion.
b. Intellectual ability; mind: a dull brain; a quick brain.
c. Intellectual power; intelligence. Often used in the plural: "he has brains and good looks."
d. A highly intelligent person."He's such a brain"
A large emigration of individuals with technical skills or knowledge, normally due to conflict, lack of opportunity, political instability, or health risks.
Another terminology for brain drain. It is a parallel of capital flight which refers to the same movement of financial capital. It describes the emigration of "scientists and technologists" to North America and Europe from different developing countries.
Preparing highly skilled people needed for the development of a country. Brain training is related to an economic cost since training is sponsored by the government.
Brain gain occurs when there is a large-scale immigration (as opposed to emigration) of technically qualified persons. We can talk of highly skilled people coming to Canada as brain gain as opposed to brain drain which refers to the act of leaving their home country.
When the highly skilled people leave a country they are replaced by others coming from other countries. This exchange usually happens between developed countries.
Stupid. "A brainless idiot."
Clever. "She's a brainy child."
When someone leaves a country permanently and go to live in another one:
"Millions of Germans emigrated from Europe to America in the nineteenth century."
The person who emigrates is an emigrant.
When someone comes to live in a different country.
There are strict limits on immigration (into the country)
The person who immigrates is an immigrant.
Highly skilled, technically qualified people.
A poor or non industrial country that is seeking to develop its resources by industrialization. It has a relatively low standard of living, an undeveloped industrial base, and a moderate to low Human Development Index (HDI) score.
A country advanced in industrial capability, technological sophistication, and economic productivity. Modern terms synonymous with the term developed country include: "industrialized countries, more developed countries (MDC) more economically developed countries(MEDC), advanced country or post-industrial country."