vipassana

This term refers to a specific meditative technique rather than a general state of mind. It is typically used within the context of Buddhist practice or mindfulness retreats, carrying a connotation of disciplined, systematic observation of the body and mind to realize the nature of impermanence.

As a specialized term for a specific practice, it is treated as an uncountable noun. One does not typically refer to multiple "vipassanas," but rather to "vipassana practice" or "a vipassana course."