It was derived from the Quenya verb ‘to be.’
Conceived in the Music of the Ainur, it was then visualized in a beautiful vision of Ilúvatar. This vision developed a life of its own without being a part of it. When the Valar entered it, they couldn’t leave it until the end as it was dark and unshaped in the beginning. After their labors, Varda, Manwë, Aulë and Ulmo worked for the formation of Arda.