A Yogini is a female who practices Yoga or has realized unity with the Self. (Yogi is the masculine term.)
An initiate of Yoga, vows to live a spiritual life that consists of constant Dhyana (meditation), Asteya (honesty, non-stealing), Satya (truthfulness), Aparigraha (abstinence), Bramacharya (integrity in intimate relationships), Ahimsa (harmlessness) and Ishvarapranidhana (surrender to God).