A siddha is one who has attained siddhi, i.e. "power, prowess, strength, ability", then a special kind of psychic and supernatural, miraculous, occult power. There are eight kinds of super natural powers called as "Ashtama Siddhis":
1. Anima (shrinking) -- Power of becoming the size of an atom and entering the smallest beings.
2. Mahima (illimitability) -- Power of becoming mighty and co-extensive with the universe. The power of increasing one's size without limit.
3. Lagima (lightness) -- Capacity to be quite light though big in size.
4. Garima (weight) -- Capacity to weigh heavy, though seemingly small size.
5. Prapthi (fulfillment of desires) -- Capacity to enter all the worlds from Brahma Loga to the neither world. It is the power of attaining everything desired.
6. Prakasysm (irresistible will) -- Power of disembodying and entering into other bodies (metempsychosis) and going to heaven and enjoying what everyone aspires for, simply from where he stays.
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