IPA: /ˈfɔːrməl.nəs/
KK: /ˈfɔrməlˌnɛs/
A quality or state of being formal, which means following established rules, customs, or ceremonies in behavior or appearance.
The formalness of the event required all guests to wear suits and ties.
Formalness → It is formed from "formal" (from Latin *formalis*, meaning pertaining to form) and "-ness" (a suffix meaning the state or quality of). The word "formalness" refers to the quality or state of being formal.
Think of 'form' as the structure or arrangement, and remember that 'formalness' means the quality of having a structured or official manner.