say it: uh-PROH-pree-uht-nuhs
appropriateness is a noun meaning "appropriate conduct; doing the right thing". It carries 2 recorded senses.
appropriate conduct; doing the right thing
the quality of being specially suitable
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for appropriateness come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.