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.
The word 'cool' underwent a remarkable semantic shift in mid-20th century jazz culture, where musicians used it to describe something excellent, and it stuck around to become one of English's most versatile words. Now 'cool' can describe temperature, personality, style, or even ethical behavior—few words have captured such diverse meanings!
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