What does 熟練 mean?
熟練 is a Japanese noun meaning “skill; expertise; experience; proficiency” in English. It is written as 熟練 in kanji, じゅくれん in hiragana, and jukuren in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
彼はそのゲームに熟練していた。
He was an old hand at the game.