migration

noun
C1+
OPAL
1
C1+
the movement every year of large numbers of birds or animals from one place to another
کوچ, کوچ سالانه, کوچ پرندگان, کوچ حیوانات, مهاجرت فصلی, کوچ فصلی
2
C1+
the movement of people to a new country or area in order to find work or better living conditions
مهاجرت, کوچ
migration from rural to urban areas
It was one of the largest mass migrations in US history.
Net migration— more people moving to the state than leaving—accounts for about two thirds of the population gain.
3
the act of moving programs, etc. from one computer system to another; the fact of changing from one computer system to another
انتقال, تغییر سیستم, مهاجرت کامپیوتری