A siddha is one who has attained siddhi, perfection. Indian traditions tell of many siddhas: the Tamil Siddhars, the eighty-four great adepts of Buddhist tantra, the Nāth yogins. In Jainism, siddhas are liberated souls dwelling at the summit of the universe.
Siddha
A perfected one: an adept who has attained the goal of yoga or tantra, often credited with powers.
Also: Siddha