noun, used as a suffix
exclusively doing ...; person who exclusively does ...; fetish for ...; someone with a fetish for ...
Slang suffix attached to nouns or noun-like stems. Indicates that someone is obsessed with or exclusively devoted to the thing. Often used in otaku or internet subcultures.
彼はゲーム専で、他のことには興味がない。
He's exclusively into games and has no interest in anything else.
あの人は猫専だから、猫カフェに毎日行くらしい。
That person has a cat fetish, so I hear they go to a cat café every day.
noun
first; most important thing; number one priority
Obsolete noun meaning the foremost or most important thing. Not used in modern Japanese outside of historical contexts.
古い文献では、専を決めることが大事だと書かれている。
In old documents, it is written that deciding what is most important is crucial.