Your Take on Technical Communications

Based on my experience and knowledge, I have always been instructed to never use the word(s) being defined within the definition for the said word(s). Is this an incorrect assumption when it comes to technical communications? Also, I realize the scope of this course is limited to the manner in which information is effectively communicated in the workplace, however, I believe that technical communication is much broader than corporate dialogue. Again, am I incorrect in my assumption?
To further expand on the definition listed for technical communication in the course guide, I would add…