katedra

1. (at a university) department; chair
   Radi kao asistent na katedri za istoriju. — He works as an assistant in the history department.
   Šef katedre je potpisao moju molbu. — The head of department signed my application.
2. (in a classroom) lectern; teacher's desk
   Profesor je stao za katedru i počeo predavanje. — The professor stepped up to the lectern and began the lecture.
3. formal (in a church) cathedra; bishop's throne; episcopal see
   U sabornoj crkvi nalazi se katedra, episkopski presto. — The cathedral church houses the cathedra, the bishop's throne.

Use "na katedri" for working in a department and "za katedrom" for standing at the lectern.