What is the meaning of emitting?

verb

• Expel (gases or odors.
  • synonyms: emit, breathe, pass off
• Give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc..
  • usage: "The ozone layer blocks some harmful rays which the sun emits"
  • synonyms: emit, give out, give off
• Express audibly; utter sounds (not necessarily words. )
  • usage: "She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand"
  • synonyms: utter, emit, let out, let loose