redovan

1. regular
   Redovni pregledi kod lekara su veoma važni. — Regular check-ups at the doctor's are very important.
   On je naš redovan gost već deset godina. — He has been our regular guest for ten years.
2. usual; ordinary; scheduled
   Redovna cena je dve hiljade dinara. — The regular price is two thousand dinars.
   Sutra je redovna sednica skupštine. — The regular session of the assembly is tomorrow.
3. (of students, study) full-time
   Ona je redovna studentkinja prava. — She is a full-time law student.

The adverb is redovno "regularly"; redovni profesor means a full professor, not an "ordinary" one.