stranka

1. party
   Za koju stranku ćeš glasati na izborima? — Which party are you going to vote for in the election?
   Njegova stranka je ušla u parlament. — His party got into parliament.
2. (at an office) client; customer
   Radno vreme za stranke je od osam do dva. — Office hours for clients are from eight to two.
   Ispred šaltera je čekalo mnogo stranaka. — A lot of customers were waiting at the counter.
3. (in court or a contract) party
   Obe stranke su prihvatile presudu. — Both parties accepted the verdict.

A side in a dispute or conflict is usually strana; stranka mostly means a political party or an office client.