For Amateur Service we have terms and definitions in 2 topics. The topics are Ham Radio and Mobile Computing.

A radio communication service for the purpose of self-training, intercommunication and technical investigations carried out by amateurs, that is, duly authorized persons interested in radio technique solely with a personal aim and without pecuniary interest.
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A radio communications service that licensed operators with no pecuniary interest use for self-training, communications, and technical investigations.
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