What is the meaning of utmost?

noun

• The greatest possible degree.
  • usage: "he tried his utmost"
  • synonyms: uttermost, maximum, level best

adjective

• Of the greatest possible degree or extent or intensity.
  • usage: "extreme cold"; "extreme caution"; "extreme pleasure"; "utmost contempt"; "to the utmost degree"; "in the uttermost distress"
  • synonyms: extreme, uttermost
• Highest in extent or degree.
  • usage: "to the last measure of human endurance"; "whether they were accomplices in the last degree or a lesser one was... To be determined individually"
  • synonyms: last
• Comparatives of `far'. ( most remote in space or time or order)
  • usage: "had traveled to the farthest frontier"; "don't go beyond the farthermost (or furthermost) tree"; "explored the furthest reaches of space"; "the utmost tip of the peninsula"
  • synonyms: farthermost, farthest, furthermost, furthest, uttermost