* Noun: When it refers to the act or process of moving from one place to another, often seasonally or for a specific purpose.
* Verb: When it describes the act of moving from one place to another, especially in a seasonal pattern.
* Adjective: Describing something related to migration, such as "migration patterns" or "migration routes".
Examples:
* Noun: The migration of birds is a fascinating natural phenomenon.
* Verb: Millions of people migrate from rural areas to cities each year.
* Adjective: The migration route of the monarch butterfly is a remarkable journey.