Immersion is the state of consciousness where an immersant's awareness of physical self is diminished or lost by being surrounded in an engrossing total environment; often artificial. This mental state is frequently accompanied by spatial excess, intense focus, a distorted sense of time, and effortless action.The term is widely used to describe immersive virtual reality, installation art and video games, but it is not clear if people are using the same word consistently. The term is also cited as a frequently-used buzzword in which case its meaning is intentionally vague, but carries the connotation of being particularly engrossing.

The sensation of total immersion in virtual reality (VR) can be described as implied complete presence within an insinuated space of a virtual surrounding where everything within that sphere relates necessarily to the proposed "reality" of that world's cyberspace and where the immersant is seemingly altogether disconnected from exterior physical space. Source: Wikipedia.org