noun
chairman of the Aikikai; head of the Aikido World Headquarters
Specific title for the head of the Aikikai, the main Aikido organization. Not a general term for a chairman.
道主は合気会の最高指導者です。
The Dōshu is the highest instructor of the Aikikai.
先代の道主は植芝盛平氏でした。
The previous Dōshu was Morihei Ueshiba.