Listed in the dictionary as a noun. It is a thing but it is an action.
vipassana (in Theravada Buddhism) meditation involving concentration on the body or its sensations, or the insight which this provides.
Vipassana, which means to see things as they really are, is one of India’s most ancient techniques of meditation. It was rediscovered by Gotama Buddha more than 2500 years ago and was taught by him as a universal remedy for universal ills, i.e., an Art Of Living. This non-sectarian technique aims for the total eradication of mental impurities and the resultant highest happiness of full liberation.
Pronunciation /vɪˈpasənə/, Origin – Pali, literally ‘inward vision’.