“Since all terms that are defined by means of other terms, it is clear that human knowledge must always be content to accept some terms as intelligible without definition, in order to have a starting-point for its definitions.”
– Bertrand Russell, Introduction to mathematical philosophy, 1920.
This is an illustration of an instance of semantic recursion, of the circularity of texts (and assertions, statements) referencing one another in a spuriously self-supporting web without concrete foundation. Some things are necessarily indefinable from within any system of thought (or communication) and it may be a matter of global aspirations to self-consistency that the discontinuity embodied by those acknowledged and actual inconsistencies in our logic have to be accepted, embraced, massaged into relative submission or at the very least – hidden from plain sight.
Daedelus Kite 