Vipassanā, clear seeing, is the development of insight into the three marks by observing body and mind closely. In the Visuddhimagga it unfolds through a series of insight knowledges to the path. In the twentieth century Burmese teachers developed intensive methods that spread worldwide as the vipassanā movement.
Vipassanā
Insight: meditation that sees directly the impermanence, suffering and not-self of experience.
Also: Vipashyana, insight meditation