osovina

1. (in a vehicle, machine) axle; shaft
   Kamionu je pukla zadnja osovina na autoputu. — The truck's rear axle broke on the highway.
   Majstor je rekao da treba zameniti kardansku osovinu. — The mechanic said the drive shaft needs replacing.
2. axis
   Zemlja se okreće oko svoje osovine za 24 sata. — The Earth rotates on its axis in 24 hours.
3. (in politics) axis
   U Drugom svetskom ratu sile Osovine su izgubile rat. — In World War II the Axis powers lost the war.

In mathematics and on graphs osa (x-osa) is usually used rather than osovina.