1) Appositeness 2) Aptness 3) Felicitousness 4) Felicity 
• (n.) The state or quality of being appropriate; peculiar fitness.
Appropriate health care is care for which the expected health benefit exceeds the expected negative consequences by a wide enough margin to justify treatment. This term is not to be confused with 'usual and customary' or 'approved' service. The extent to which a particular procedure, treatment, test, or service is clearly indicated, not excessive, ...
Ap·pro'pri·ate·ness noun The state or quality of being appropriate; peculiar fitness. Froude. 
[n] - appropriate conduct 2. [n] - the quality of being specially suitable
noun the quality of being specially suitable