samadhi2

So, samadhi may refer to any of the highest levels of consciousness, in or out of trance. These states may be achieved by Yoga practice or by other means. It is the eighth and last stage of Yoga in Patanjali's analysis of yoga; most systems of Hatha Yoga likewise view samadhi as the state of ultimate achievement. In Buddhism, samadhi is the fourth and final stage of Dhyana or intense abstract meditation.
There are many levels of samadhi, which are given many different names. The lower forms of this absorption may be called saguna-samadhi (with attributes), savitarka-samadhi (with deliberation), savikalpa-samadhi (with change), savichara-samadhi (with reflection), sabija-samadhi (with seed), etc.
The higher forms of this absorption may be called nirguna-samadhi (without attributes), nirvitarka-samadhi (without deliberation), nirvikalpa-samadhi (without change or differences), nirvichara-samadhi (without reflection), nirbija-samadhi (without seed), etc.
Samadhi is the final of the eight stages given in Patanjali's analysis of the yoga systems.
"Samadhi is that same dhyana, when the object [of meditation] shines by it's own self, as if devoid [of form] or free [of the meditator]. (Yoga Sutras 3:3)