noun
full mastery of an art; initiation into the secrets of an art; full mastership
Traditional term used in martial arts and classical arts to denote that a student has received full transmission of the school's teachings and secrets. Often used figuratively to mean complete mastery of a skill.
彼は師匠から免許皆伝を授かった。
He received full mastership from his teacher.
彼女のピアノの腕前はまさに免許皆伝だ。
Her piano skills are truly at the level of full mastery.