The word "definitional" refers to something that pertains to or is related to a definition. It involves describing or explaining the meaning of a word, concept, or idea.
Confidence is limited because of definitional issues regarding how to classify and measure a drought, a lack of observational data and the inability of models to include all the factors that influence droughts. (dotearth.blogs.nytimes.com)
This technical document provides background on definitional issues related to reducing emissions from deforestation in developing countries. (uncclearn.org)
Knowing what services are «public» for this purpose raises definitional questions beyond the scope of this note. (slaw.ca)