What is the meaning of prolonged?

verb

• Lengthen in time; cause to be or last longer.
  • usage: "We prolonged our stay"; "She extended her visit by another day"; "The meeting was drawn out until midnight"
  • synonyms: prolong, protract, extend, draw out
• Lengthen or extend in duration or space.
  • usage: "We sustained the diplomatic negotiations as long as possible"; "prolong the treatment of the patient"; "keep up the good work"
  • synonyms: prolong, sustain, keep up

adjective

• Relatively long in duration; tediously protracted.
  • usage: "a drawn-out argument"; "an extended discussion"; "a lengthy visit from her mother-in-law"; "a prolonged and bitter struggle"; "protracted negotiations"
  • synonyms: drawn-out, extended, lengthy, protracted
• Drawn out or made longer spatially.
  • usage: "Picasso's elongated Don Quixote"; "lengthened skirts are fashionable this year"; "the extended airport runways can accommodate larger planes"; "a prolonged black line across the page"
  • synonyms: elongated, extended, lengthened