Meaning and elaboration
Meaning: The Accomplished One, embodying spiritual perfection and attainment.
Elaboration
Siddhi means "accomplishment," "perfection," "attainment," or "success." As a name of Mahakali, it reveals her as both the fullness of spiritual attainment and the power that grants it.
Embodiment of Spiritual Perfection As Siddhi, Kali is the very essence of spiritual perfection. She is the state in which desire, division, and limitation have been transcended. She is the goal of spiritual striving: complete union with the Divine and the realization of one's true nature beyond temporal and material constraint.
Grantor of Siddhis Siddhi also refers to the extraordinary powers attained through intense spiritual practice (sadhana). Kali, as Siddhi, is not only the supreme Siddhi herself, but also the generous giver of powers, both worldly and extraordinary, to her devoted sadhakas. These include anima (miniaturization), mahima (magnification), laghima (levitation), garima (heaviness), prapti (attainment of anything), prakamya (irresistible will), ishitva (lordship over all), and vashitva (control over all). Yet the highest Siddhi she bestows is moksha, ultimate liberation.
Ultimate Attainment and Liberation For the spiritual seeker, to approach Kali as Siddhi is to seek the highest attainment: self-realization and release from the cycle of birth and death (samsara). She destroys the illusions that bind the individual soul and opens the way to absolute freedom and transcendental wisdom. In this sense, her name Siddhi reveals her as the one who brings the spiritual journey to completion and leads the seeker to the highest state of consciousness.