1. (鱼类、鸟兽)迁徙的，迁移的，移栖的
A migratory bird, fish, or animal is one that migrates every year.

2. 移居的;迁徙的;迁移的
Migratory means relating to the migration of people, birds, fish, or animals.

1. habitually moving from place to place especially in search of seasonal work

e.g. appalled by the social conditions of migrant life
migratory workers

Synonym: migrant

2. used of animals that move seasonally

e.g. migratory birds