Reality Technology Terminology and Definitions

Whether you are an entrepreneur interested in developing new virtual reality content or an enthusiast looking to purchase your first headset, you will likely come across new terms that may not be well defined in a standard dictionary. This glossary is a complete 101 guide to help you understand these new terms commonly found in this rapidly evolving technology. Our glossary of reality technology terms provides definitions for common terminology, their meanings and commonly used industry acronyms.

Augmented Reality

A type of virtual reality, which augments a live direct or indirect view of a physical real-world environment, and computer-generated images are superimposed on a user’s view of the real-world, thus enhancing one’s current perception of reality.

Augmented Virtuality

A type of reality where real-world objects are inserted into virtual computer-generated environments. In augmented virtuality, real multi-sensory input is provided, which supplements the visually presented virtual environment.

Base Station

Often in the form of small rectangular boxes, are devices placed in the tracking area to serve as reference points for any HMDs and input devices tracked. Base Stations perform this function by constantly flooding the room with a non-visible light. The receptors on the tracked devices would intercept the light and figure out where they are in relation to the Base Stations.


See “Base Station”

Frame Rate

In computer video displays, motion pictures, and television, frame rate refers to the number (or frequency) of frames or images that are projected or displayed per second. Frame rate is usually expressed in frames per second (FPS).

Head-Mounted Display (HMD)

In the context of virtual reality, a head-mounted display (also called HMD) is either a pair of goggles or a full helmet that users wear to fully immerse them in virtual experiences. Inside of the HMD, there are tiny monitors in front of each eye which allows for images to appear as three-dimensional. In addition, most HMDs include head tracking sensors so that the system can respond to a user’s head movements.

Minimum Frame Rate

The amount of frames per second that is needed to avoid stuttering or user simulation sickness. The higher the framerate, the more realistic a virtual reality experience will feel.

Mixed Reality (Independent)

The predominantly virtual spaces where real world objects or people are dynamically integrated into virtual worlds to produce new environments and visualizations where physical and digital objects co-exist and interact in real time.

Mixed Reality (Continuum)

The continuous scale ranging which covers all possible variations and compositions of real and virtual objects. The continuum ranges from a completely real and natural environment, to a completely virtual environment. The concept was first introduced by Paul Milgram.


In the context of reality technologies, is when enough of one’s senses have been stimulated to the point that the user feels, believes, and accepts that they are physically occupying a new virtual world. Achieving comfortable, sustained presence requires a combination of the proper virtual reality content and hardware.

Refresh Rate

The number of times in a second that a display hardware will update its buffer, thus, how quickly a display hardware can change its content over a particular length of time. This is different from the measure of frame rate, in that refresh rate includes the repeated drawing of identical frames, while frame rate measures how often a video source can feed an entire frame of new data to a display.

Simulation Sickness

In the context of virtual reality, simulation sickness refers to the feeling of dizziness and nauseousness. It is different from motion sickness because it can be caused without any movement, rather by the visually-induced perception of movement. The physiology behind VR sickness is believed to be caused by slower than required refresh rate of on-screen images. This is when the refresh rate is slower than what the human brain processes, which causes a discord between the VR refresh rate and the human brain processing rate; the result is perceived glitches on the screen.

Virtual Reality

A realistic simulation of an environment that is created with a mixture of interactive hardware and software, and presented to the user in such a way that the user suspends belief and accepts it as a real environment.

Virtual Reality (VR) Glasses

See “Head-Mounted Display (HMD)”

Virtual Reality (VR) Headset

See “Head-Mounted Display (HMD)”

Virtual Reality (VR) Sickness

See “Simulation Sickness”

Virtual World

A three dimensional environment, often (but not necessarily) realized through a medium (rendering pipeline, display, etc.), where one can interact with others and create objects as part of that interaction.