a third
Apenas un tercio del país tiene acceso a la red.
Barely a third of the country has access to the network.
Si vas en autobús, puedes llegar allí en más o menos un tercio del tiempo.
If you go by bus, you can get there in about a third of the time.
Un tercio del territorio de Suiza está cubierto de bosques.
One-third of Switzerland’s territory is covered by forests.
Full speed ahead at one-third throttle.
— El submarino (Das Boot) (1981)
Ambos motores adelante a un tercio.
Both engines forward at one-third speed.
— El submarino (Das Boot) (1981)
Hay un tercio del país sin trabajo.
There is a third of the country without work.