fluid

1. (of a person or place) vibe; aura
   Taj čovek ima neki poseban fluid. — That man has a special kind of aura.
   U ovom kafiću je dobar fluid. — This café has a good vibe.
2. (in physics, technology) fluid
   Kočioni fluid treba povremeno menjati. — Brake fluid needs to be changed from time to time.