Wiktionary
a. Pertaining to metamathematics, a branch of mathematics dealing with mathematical systems and their nature
Usage examples of "metamathematical".
The country needs only a few of these supercars, and this one has been set aside for the use and utmost ease of the two genius-type riders who wish to discuss highflown quantum-physical, metamathematical, and cybernetic topics without the burden of paying attention to the road.
For the machine itself he planned to use logically coded values rather than numbers except in the metamathematical sphere, where the need to arithmetize required numbering of the formal expressions (if he could figure out how to do it), the natural number series in this case beginning neither with zero (Peano, Hubert) nor with one (Dedekind) but, for technical reasons involving logical constants and their negations, with minus-one (Lown, Bolin).