1. understood by or meant for only the select few who have special knowledge or interest; recondite: poetry full of esoteric allusions. 2. belonging to the select few. 3. private; secret; confidential. 4. (of a philosophical doctrine or the like) intended to be revealed only to the initiates of a group: the esoteric doctrines of Pythagoras."
* Previously known as the International Order of Co-Freemasonry.