What is the meaning of cooler?

noun

• A refrigerator for cooling liquids.
  • synonyms: ice chest
• An iced drink especially white wine and fruit juice.
• A cell for violent prisoners.
  • synonyms: tank

adjective

• Neither warm nor very cold; giving relief from heat.
  • usage: "a cool autumn day"; "a cool room"; "cool summer dresses"; "cool drinks"; "a cool breeze"
  • synonyms: cool
• Marked by calm self-control (especially in trying circumstances); unemotional.
  • usage: "play it cool"; "keep cool"; "stayed coolheaded in the crisis"; "the most nerveless winner in the history of the tournament"
  • synonyms: cool, coolheaded, nerveless
• Color) inducing the impression of coolness; used especially of greens and blues and violets. (
  • usage: "cool greens and blues and violets"
  • synonyms: cool
• Psychologically cool and unenthusiastic; unfriendly or unresponsive or showing dislike.
  • usage: "relations were cool and polite"; "a cool reception"; "cool to the idea of higher taxes"
  • synonyms: cool
• Used of a number or sum. ( without exaggeration or qualification)
  • usage: "a cool million bucks"
  • synonyms: cool
• Fashionable and attractive at the time; often skilled or socially adept.
  • usage: "he's a cool dude"; "that's cool"; "Mary's dress is really cool"; "it's not cool to arrive at a party too early"
  • synonyms: cool