== Merge to Register (sociolinguistics) == 

 The more commonly used term for a variety of language associated with a particular context of use is register. I can find only five articles that use the term diatype (in the relevant sense - searching is complicated by the existence of the term DIA-type apparatus in physics). Since it is only about 200 words, Diatype could easily be made a section of the page Register (sociolinguistics).