noun (n)

• an examination and dissection of a dead body to determine cause of death or the changes produced by disease(noun.act)

  Synonym:
  autopsy, necropsy, post-mortem, post-mortem examination, postmortem, postmortem examination
  

  source: wordnet30
• a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium(noun.substance)

  Synonym:
  atomic number 61, promethium
  

  source: wordnet30
• the person who holds the position of head of the government in the United Kingdom(noun.person)

  Synonym:
  premier, prime minister
  

  source: wordnet30
• modulation of the phase of the carrier wave(noun.communication)

  Synonym:
  phase modulation
  

  source: wordnet30