Siddha

Siddha – One who is accomplished (talented, gifted, skillfull, proficient, expert)
A siddha सिद्ध in Sanskrit means "one who is accomplished" and refers to perfected masters who, according to Hindu belief, have transcended the ahamkara (ego or I-maker), have subdued their minds to be subservient to their Awareness, and have transformed their bodies (composed mainly of dense Rajo-tama gunas) into a different kind of body dominated by sattva. This is usually accomplished only by persistent meditation.
A siddha has also been defined to refer to one who has attained a siddhi. The siddhis as paranormal abilities are considered emergent abilities of an individual that is on the path to siddhahood, and do not define a siddha, who is established in the Pranav or Aum – the spiritual substrate of creation. The siddhi in its pure form means "the attainment of flawless identity with Reality (Brahman); perfection of Spirit."
Siddha also refers to a Siddha Guru who can by way of Shaktipat initiate disciples into Yoga.