the scientific idea that plants and animals develop and change gradually over a long period of time, evolution of, The evolution of mammals, The evolution of the human species, theory of evolution, Darwin's theory of evolution, human evolution
relating to the way in which ideas or situations gradually change and develop over a long period of time, evolution of, the evolution of the computer, evolution (= gradual development) <> revolution (= sudden violent change)
evolutionary theory / biology
the evolutionary development of birds
He is in favour of gradual, evolutionary social change.
if an animal or plant evolves, it changes gradually over a long period of time, evolve from sth, Fish evolved from prehistoric sea creatures., The three species evolved from a single ancestor
to develop gradually, especially from a simple to a more complicated form; to develop sth in this way, evolved (sth) (from sth) (into sth) to develop gradually, The idea evolved from a drawing I discovered in the attic, The group gradually evolved into a political party.
if birds or animals migrate, they travel regularly from one part of the world to another, Swallows migrate south in winter.
if people migrate, they go to live in another area or country, especially in order to find work, Farmers have learned that they have to migrate if they want to survive.
(technical) to move from one place to another, The infected cells then migrate to other areas of the body.
the movement of large numbers of people, birds or animals from one place to another, seasonal migration, mass migrations, the migration routes of birds
someone who goes to live in another area or country, especially in order to find work, migrant worker/labourer, A lot of factory work is done by migrant workers., economic migrant (=someone who goes to live in another country because they are likely to find a better job there), They claimed they were political refugees and not economic migrants
a bird or an animal that moves from one place to another according to the season, Migrant birds shelter in the reeds.
to leave your own country in order to live in another country, The family left Greece in 1974 and emigrated to America
migration from a place (especially migration from your native country in order to settle in another);
someone who leaves their own country to live in another, emigrant families / labour / workers, emigrants to Canada
someone who enters another country to live there permanently, immigrate (to ...) (from ...)
the process of coming to live permanently in a country that is not your own; the number of people who do this:, laws restricting immigration into the US, Immigration fell in the 1980s., a rise / fall in immigration, immigration officers
someone who enters another country to live there permanently, illegal immigrants, immigrant communities / families / workers /visas, a new wave of immigrants from the Middle East