(Hebrew יסוד means foundation) The ninth sephirah of the the Tree of Life (Kabbalah). In the macrocosmic universe, Yesod is the fourth dimension. In the microcosmic universe (man), Yesod corresponds to the sexual organs and to the Ethereal body. In the Bible, Yesod is Eden, the Promised Land.
Yetzirah
Yetzirah יצירה – The third of four worlds in the Kabbalah. It is the world of formation and of the Angels.
Yetzirah [יצירה], the world of Formation. Example: the child is formed in the womb for nine months. Cosmic Evolution in the Bible
“And IHVH Elohim יצר formed man…” – Genesis 2:7
Yetzirah
Yoga
(Sanskrit योग) “union.” Similar to the Latin “religare,” the root of the word “religion.” In Tibetan, it is “rnal-‘byor” which means “union with the fundamental nature of reality.”
“The word YOGA comes from the root Yuj which means to join, and in its spiritual sense, it is that process by which the human spirit is brought into near and conscious communion with, or is merged in, the Divine Spirit, according as the nature of the human spirit is held to be separate from (Dvaita, Visishtadvaita) or one with (Advaita) the Divine Spirit.” – Swami Sivananda, Kundalini Yoga