I wrote a note to myself some time ago that “A definition is the most basic fact.” I feel like I posted it here, but would approach it perhaps differently than I did before. Clearly, words can be made to mean anything, but a definition is what I mean, and the better the definition, the better you understand me. It is a means for organizing thought, and for preventing miscommunication.
In actual science, the value is that you can POINT to a concrete thing or process or outcome, which you then term a “fact”.
However, the need for definitions in the Humanities is perhaps only heightened by the possibility of ambiguity. It is perhaps not overstating the case to say that virtually all of our contemporary social ills stem from abuses of language stemming from failures of definition.
What you mean by “justice” matters, does it not? Truth? Beauty?