I understand trans-theoretic to be adjective applied to words like "truth" which some might claim to be independent
of the theoretical context in which they are used. E.g. some might claim that "truth is trans-theoretic" because it refers to a quality
independent of "the correspondence theory" or "the coherence theory".
A scientist using the "truth" in a trans-theoretical sense might simply be claiming that a particular theory is useful
and is therefore open to replacement.