tercero
/teɾˈθeɾo/ · B1 · adj
third party
🥉 From Latin tertius, the same root as English tertiary: third in line
Primero, segundo, tercero: first, second, third. A tercero is also the third party who steps in between two sides, which is why it can mean mediator. Before a masculine noun it shortens to tercer, as in el tercer día.