| Answer | Crossword Clue |
|---|---|
| grammar | the study of the formal features of a language |
| grammars | GRAMMAR, the study of the formal features of a language |
| metamathematics | a field of study concerned with the formal structure and properties (as the consistency and completeness of axioms) of mathematical systems |
| photogeology | a branch of geology concerned with the identification and study of geological features through the study of aerial or orbital photographs |
| photogeologies | PHOTOGEOLOGY, a branch of geology concerned with the identification and study of geological features through the study of aerial or orbital photographs |
| superstratum | set of features of a language traceable to the influence of a language formerly spoken within the same society by a dominant group |
