Mother is the formal term for Mum
When i need to see you mum :D
The formal term for a master's degree is a "postgraduate degree."
A declaration is a formal statement of opinion.
thereupon
amendment
myopia
mum A term that equals mom in british. Exampl: Ron Weasley: But mum!
ya mum
u mum pushy
Blacking out (less formal) or losing consciousness (more formal).
Current events
An argumentum is a formal term for an argument.