n. The act of migrating; change of residence or habitat; removal or transit from one locality or latitude to another, especially at a distance.n. A number of animals migrating together; the total of the individuals or species which perform any particular migration; also, the time or period occupied in migrating Change of place; removal.n. Residence in a foreign country; banishment.n. In phytogeography, the movement of plants from one area into another. According to F. E. Clements this is properly a narrower term than invasion. See invasion, 4.