Dhyana names the perfection of concentration, the capacity to hold the mind stably on a single object without the wandering, dullness or agitation that ordinarily interrupt sustained attention, and Mahayana texts treat it as the fifth perfection because everything before it, giving, ethical conduct, patience and diligence, produces exactly the settled, undistracted mind concentration then stabilises further. The term is the direct ancestor, by way of Chinese chan and Japanese zen, of entire schools of Buddhism organised around meditative practice as the primary vehicle of realisation, though within the paramita scheme dhyana is one perfection among six rather than a complete path on its own, a distinction those later schools address in different ways, some treating meditation as sufficient in itself and others retaining the full sequence explicitly.
The classical technical analysis inherited from earlier Abhidharma literature describes four progressively refined states, the four jhanas, moving from concentration accompanied by directed thought and sustained investigation through states of increasingly pure equanimity and one pointedness, a graded map Mahayana commentary generally accepts as the underlying mechanics even where its own emphasis lies elsewhere, on dhyana's function within the bodhisattva path rather than as an end state pursued for its own sake.