message
1. Any thought or idea expressed briefly in a plain or secret language, prepared in a form suitable for transmission by any means of communication. [JP 1-02]
Note: A message may be a one-unit message or a multiunit message.
2. [In telecommunications,] Record information expressed in plain or encrypted language and prepared in a format specified for intended transmission by a telecommunications system. [JP1]
3. An arbitrary amount of information whose beginning and end are defined or implied.
4. A completed call, i.e., a communication in which a conversation or exchange of information took place between the calling and called parties. [47 CFR Pt.36-A]