koren

1. root
   Ovo drvo ima jako duboko korenje. — This tree has very deep roots.
   Zubar mora da mi leči koren zuba. — The dentist has to treat the root of my tooth.
2. root; source; origin
   Novac je koren svih problema. — Money is the root of all problems.
   Njegovi koreni su iz Crne Gore. — His roots are in Montenegro.
3. (in mathematics) root
   Kvadratni koren iz devet je tri. — The square root of nine is three.
   Ova jednačina ima dva realna korena. — This equation has two real roots.
4. (in grammar) root
   Reči „voda” i „vodeni” imaju isti koren. — The words "voda" and "vodeni" share the same root.

For plant roots, the collective noun korenje is common and takes singular agreement; for ancestry, the plural koreni is used.