Moderately cold; neither warm nor very cold. The cool breeze was refreshing on a hot summer day.
Calm and composed; not excited or emotional. She remained cool under pressure during the interview.
Fashionable or stylish; trendy. He wore a cool jacket that everyone admired.
Socially adept or popular; admired by others. He was considered the cool kid in school because of his charisma.
Used to emphasize that an amount (especially of money) is impressively large. She inherited a cool $5 million from her grandfather.
Good, satisfactory, or acceptable; okay. Is it cool if I leave a little early?