Definition - What does Samadhana mean?
Samadhana is the sixth and final of the six-fold set of virtues known as shat-sampat, which are taught in jnana yoga. These six virtues are used by jnana yogis to train the mind to see past the illusory nature of the physical world.
Samadhana itself means “complete concentration and mental focus.” It is derived from the Sanskrit samadha, which has many translations, including “putting together, uniting or fixing the mind in abstract contemplation on the true nature of the soul,” and “contemplating oneness.”
It can be thought as keeping the goal of striving for the ultimate realization always in mind.
Yogapedia explains Samadhana
The other five virtues which make up the shat-sampat are:
Shama - staying calm
Dama - having control over reactions
Uparati - relinquishing what does not align with one’s dharma or duty
Titiksha - persevering in the face of suffering
Shradda - having faith and trust in the path of yoga
By developing the other five virtues, the yogi is then able to cultivate samadhana. It requires a complete detachment from selfish desires such that the mind can be held on single point. Once this is achieved, the yogi can find a state of perfect poise and tranquillity in which it delights in the concept of the truth.
Samadhana is said to be one of the four prerequisites for the realization of Brahman and finding moksha or liberation.