pojačanje

1. amplification; strengthening; increase
   Najavljeno je pojačanje kontrola na granici. — Tighter border checks have been announced.
   Ovaj uređaj služi za pojačanje signala. — This device is used to amplify the signal.
2. (of people) reinforcements
   Policija je pozvala pojačanje. — The police called for backup.
3. (in sports) new signing
   Zvezda je dovela dva nova pojačanja. — Red Star brought in two new signings.

In the sense of 'reinforcements' it is usually singular and collective: stiglo je pojačanje.