Skill; expertise; proficiency acquired through experience; being well-practiced in a craft or task.
熟練の職人が一つ一つ丁寧に手作業で仕上げた。
A skilled craftsman finished each piece carefully by hand.
その作業は熟練を要するため、新人には難しい。
That task requires skill, so it is difficult for newcomers.
彼は熟練工として会社で重宝されている。
He is valued at the company as an experienced worker.