This simple ending allows us to choose one of
something from an implied list.
To create this, we add 
 -ik     to the item, and precede it with the definite article.
Even though an implied list means several items, the qualifier is placed into the singular.
- 
az egyik  one of (them) 
 
- 
a másik   the other (of them) 
 
- 
a nagyobbik   the larger (of them) 
 
- 
a kisebbik   the smaller (of them) 
 
- 
melyik?   which (of them)? 
 
Here is an example:
az egyik barátom one of my friends Note how barátom is singular.