Here’s the definition the consultant provided in the current version of the rvX manual:
Although there may be a number of definitions, one that has been used in the RV field could be paraphrased as: the skills or abilities to attain information about anything at any point in time. Another one that Ed Dames has mentioned is that RV is an attention management skill. Remote viewing in the psi research field is also called clairvoyance. Although “viewing” and “clairvoyance” implies visual information, other information can be attained when remote viewing including olfactory, auditory, tactile, and kinesthetic information, just to name a few. Since Remote Viewing can be used to obtain many categories of information (rather than being restricted to visual information) about a target, a more accurate name for the skill of Remote Viewing might be another name such as Remote Perception or Remote Sensing. However, many people call it Remote Viewing because it is more commonly used and more recognizable.