blagajna

1. checkout; cash desk
   Platite na blagajni, molim vas. — Please pay at the checkout.
   Na blagajni u marketu bio je dug red. — There was a long queue at the supermarket checkout.
2. (at a theatre, cinema, station) box office; ticket office
   Karte možete kupiti na blagajni pozorišta. — You can buy tickets at the theatre box office.
3. (of a state, organisation) treasury; funds
   Novac za most ide iz gradske blagajne. — The money for the bridge comes from the city treasury.
   Državna blagajna je skoro prazna. — The state treasury is almost empty.

In shops, "kasa" is the more common everyday word.