This is the 11129th most frequent Spanish word.
emigración
The act of leaving one's own country to live in another.
Here, 'emigración' serves as a noun denoting the act or concept of moving away from one's homeland.
La emigración puede ser una decisión difícil para muchas personas.
Emigration can be a difficult decision for many people.
In this usage, 'emigración' is used to describe the phenomenon of a large number of people leaving a specific area.
Están investigando las causas de la emigración masiva en esa región.
They are investigating the causes of mass emigration in that region.
In this sentence, 'emigración' specifies the context and demographic focus of the subject in question, namely, the relocation of young professionals.