the GNU version of the Collaborative International Dictionary of English
n. The quality or state of being placid; calmness; serenity.
The Century Dictionary and Cyclopedia
n. The state or character of being placid; tranquillity; peacefulness; quietness; calmness.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a feeling of calmness; a quiet and undisturbed feeling
n. a disposition free from stress or emotion
Word Usage
"The other is elitism, a charge that clearly grates on him and unnerves his wife, who has a great deal that would be attractive in a first lady (intelligence, accomplishment, beauty) but lacks placidity, which is, actually, necessary."