emit in WordNet English dictionary

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