Current events
Mother is the formal term for Mum
The formal term for a master's degree is a "postgraduate degree."
A declaration is a formal statement of opinion.
thereupon
amendment
myopia
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).
An argumentum is a formal term for an argument.
tier
symmetrical.