migrations
n. C / Un. the movements of large groups of people or animals from one place to another. This usually happens because they are looking for better weather, food, or a safer home.
n. the seasonal or periodic movements of animals or humans from one region to another, typically for survival, climate, or economic reasons.
Bird migrations happen every year when the weather gets cold.
Scientists track the annual migrations of monarch butterflies as they travel thousands of miles to reach warmer forests.
The history of the continent is defined by successive migrations of people seeking fertile land, which led to a complex blending of languages and traditions over several centuries.
Often used in the plural to describe the general phenomenon or multiple specific events; the singular form refers to a single instance of movement.