Mother is the formal term for Mum
myopia
thereupon
amendment
The African Luhya term for the English news is Amacheni.
Yes, it can be an adjective based on the noun form. Formal has a connotation of an important or official occasion (e.g. formal dinner, formal wear, formal complaint).
Blacking out (less formal) or losing consciousness (more formal).
tier
Kinesics
An argumentum is a formal term for an argument.
symmetrical.
The formal term for foot fetish "podophilia"