Also means
expanse
Usage Note
Extensión is used for physical extent (la extensión del territorio), a phone extension number (llama a la extensión 305), and the prolonging of a deadline (una extensión del plazo). The verb extender covers 'to spread' and 'to extend'. Do not confuse extensión with extenso (adjective, 'extensive/lengthy'), which has a different form.
Examples
"La extensión del desierto es enorme."
Natural Translation
The expanse of the desert is enormous.

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