1. Skilled at, good at, proficient in: This is the most common meaning of "tokui." It refers to something that someone is good at or has a talent for.
Example:
* 私はピアノが得意です。 (Watashi wa piano ga tokui desu.) - I'm good at playing the piano.
2. Favorite, preferred, something you like: This meaning is less common but still used. It refers to something someone enjoys or prefers.
Example:
* 私の得意な食べ物はラーメンです。 (Watashi no tokui na tabemono wa ramen desu.) - My favorite food is ramen.
It's important to note that the context will usually make it clear which meaning of "tokui" is intended.