coolness

from The Century Dictionary.

• noun A moderate degree of cold; a temperature between cold and heat: as, the coolness of the summer's evening.
• noun A moderate or refreshing sensation of cold.
• noun Absence of mental confusion or excitement; clearness of judgment and calmness of action, particularly in an emergency: as, the safety of the party depended on his coolness.
• noun Absence of ardor or intensity; want of passion, zeal, cordiality, or affection; indifference.
• noun Quiet and unabashed impudence; nonchalance; effrontery; presumption.

from the GNU version of the Collaborative International Dictionary of English.

• noun The state of being cool; a moderate degree of cold; a moderate degree, or a want, of passion; want of ardor, zeal, or affection; calmness.
• noun colloq. Calm impudence; self-possession.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable The state of being cool, as in chilly.
• noun countable The result or product of being cool, as in chilly.
• noun slang, uncountable The state of being cool, as in good or pleasing.
• noun slang, countable The result or product of being cool, as in good or pleasing.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a lack of affection or enthusiasm
• noun calm and unruffled self-assurance
• noun fearless self-possession in the face of danger
• noun the property of being moderately cold