What is the meaning of echoing?

verb

• To say again or imitate.
  • usage: "followers echoing the cries of their leaders"
  • synonyms: repeat, echo
• Ring or echo with sound.
  • usage: "the hall resounded with laughter"
  • synonyms: resound, echo, ring, reverberate
• Call to mind.
  • usage: "His words echoed John F. Kennedy"
  • synonyms: echo, recall

adjective

• Of sounds. ( repeating by reflection)
  • usage: "a hotel with echoing halls"
  • synonyms: reechoing