This is the 977th most frequent Turkish word.
etkin
Effective; active.
Here, 'etkin' describes someone as 'effective' or proficient.
Onun etkin bir lider olduğunu düşünüyorum.
I think he is an effective leader.
Here, 'etkinlik' (derived from 'etkin') means an 'event' or 'activity'.
Bu etkinlikte çok şey öğrendim.
I learned a lot at this event.
Here, 'etkin' is used to describe the environment as being more efficient or effective due to the regulations.