naime

1. the thing is; you see
   Nisam došao na posao. Naime, bio sam bolestan. — I didn't come to work. The thing is, I was sick.
   Cene su porasle, naime, struja je poskupela. — Prices went up; you see, electricity got more expensive.
2. formal namely
   Ostao je samo jedan problem, naime novac. — Only one problem remained, namely money.

Often stands at the start of a sentence or is set off by commas.