Coolness is an admired aesthetic of attitude, behavior, comportment, appearance and style, influenced by and a product of the Zeitgeist (‘spirit of the age’). Because of the varied and changing connotations of cool, as well its subjective nature, the word has no single meaning.
It has associations of composure and self-control and often is used as an expression of approval. Although commonly regarded as slang, it is widely used among disparate social groups, and has endured in usage for generations. Because there is no single concept of cool, one of its essential characteristics is mutability—what is considered cool changes over time and varies among cultures and generations.
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The Daily Omnivore 