administration: Any governmental department or service responsible for discharging the obligations undertaken in the Constitution of the International Telecommunication Union, in the Convention of the International Telecommunication Union and in the Administrative Regulations (CS 1002).
telecommunication: Any transmission, emission or reception of signs, signals, writings, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems (CS).
radio: A general term applied to the use of radio waves.
radio waves or hertzian waves: Electromagnetic waves of frequencies arbitrarily lower than 3 000 GHz, propagated in space without artificial guide.
radiocommunication: Telecommunication by means of radio waves (CS) (CV).
terrestrial radiocommunication: Any radiocommunication other than space radiocommunication or radio astronomy.
space radiocommunication: Any radiocommunication involving the use of one or more space stations or the use of one or more reflecting satellites or other objects in space.
radiodetermination: The determination of the position, velocity and/or other characteristics of an object, or the obtaining of information relating to these parameters, by means of the propagation properties of radio waves.
radionavigation: Radiodetermination used for the purposes of navigation, including obstruction warning.
radiolocation: Radiodetermination used for purposes other than those of radionavigation.
radio direction-finding: Radiodetermination using the reception of radio waves for the purpose of determining the direction of a station or object.
radio astronomy: Astronomy based on the reception of radio waves of cosmic origin.
Coordinated Universal Time (UTC): Time scale, based on the second (SI), as defined in ITU-R Recommendation ITU-R TF.460-5.
For most practical purposes associated with the Radio Regulations, UTC is equivalent to mean solar time at the prime meridian (0° longitude), formerly expressed in GMT.
industrial, scientific and medical (ISM) applications (of radio frequency energy): Operation of equipment or appliances designed to generate and use locally radio frequency energy for industrial, scientific, medical, domestic or similar purposes, excluding applications in the field of telecommunications.