1. Appropriate conduct; doing the right thing
   "The appropriateness of her formal attire was noted at the gala";
   - rightness
    
2. The quality of being specially suitable
   "The appropriateness of her formal attire for the gala was noted by all"

See also: appropriate, apropos, inappropriate, malapropos

Type of: correctitude, properness, propriety, suitability, suitableness

Antonym: inappropriateness