The most calm, composed, or fashionable; having the lowest temperature or the most admirable quality.
From Middle English 'cool' (c. 1300s) meaning 'of low temperature,' from Old English 'col.' The superlative form 'coolest' adds the suffix '-est' to indicate the extreme degree. By the 20th century, 'cool' evolved to mean fashionable or impressive in slang usage.
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