oploditi

1. to fertilize; to impregnate
   Jajna ćelija je oplođena u laboratoriji. — The egg was fertilized in a laboratory.
   Mužjak je oplodio jaja koja je ženka položila u gnezdo. — The male fertilized the eggs the female had laid in the nest.
2. (of money, capital) to make grow; to invest profitably
   Želim da oplodim ušteđevinu, a ne da stoji u banci. — I want my savings to grow, not just sit in the bank.
3. formal (of ideas, creative work) to enrich; to inspire
   Putovanja su oplodila njegovo stvaralaštvo. — Travel enriched his creative work.

The imperfective is oplođivati.