This is the 1161st most frequent Spanish word.
expansión
Expansion; the act or process of increasing in size, scope, or extent.
In this sentence, "expansión" refers to the process of increase in scope or scale, particularly in an economic context.
La expansión económica del país ha generado nuevas oportunidades laborales.
The economic expansion of the country has generated new job opportunities.
Here, "expansión" is used to describe the physical growth or enlargement of an empire's territorial limits.
El imperio romano alcanzó su mayor expansión en el siglo II.
The Roman Empire reached its largest expansion in the 2nd century.
"Expansión" in this example pertains to the physical process of a substance spreading out or increasing its volume in response to certain conditions.