The state or condition of being fitting; suitability.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "fittingness" in a sentence
"On the other hand, there is a certain fittingness to packaging these two films together."
"Though such a thematic doesn’t seem logically necessary to begin with, it exhibits an incalculably rich symbolic coherence as well as that gloriously gratuitous fittingness which is a mark of perfect Love."
""de congruo," that is, a merit of simple "fittingness," which is characteristic of every angelic and human creature."