This is the 2196th most frequent Spanish word.
extensión
"Extensión" in English means "extension" or "expanse," referring to the act of extending, an area, or the range of something.
In this context, 'extensión' refers to the suffix of a file name that indicates a file type.
La extensión del archivo es '.doc'.
The file extension is '.doc'.
Here, 'extensión' is used to signify a prolongation or addition of time.
El proyecto tuvo una extensión de seis meses adicionales.
The project had an extension of six additional months.
In this case, 'extensión' describes the spatial size or scope of an area.