IPA: /ˈfɪtɪŋnəs/
KK: /ˈfɪtɪŋnəs/
The quality of being appropriate or suitable for a particular purpose or situation.
The fittingness of her outfit for the occasion impressed everyone at the party.
Fittingness → It is formed from "fitting" (from Old English "fittan", meaning to be suitable or appropriate) and "-ness" (meaning the state or quality of). The word "fittingness" refers to the quality of being suitable or appropriate.
Think of the word 'fitting' which means suitable, and remember that 'fittingness' describes the state of being suitable.