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WordNet (r) 3.0 (2006) (WordNet)

PM
n 1: an examination and dissection of a dead body to determine
cause of death or the changes produced by disease [synonym:
{autopsy}, {necropsy}, {postmortem}, {post-mortem}, {PM},
{postmortem examination}, {post-mortem examination}]
2: 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 [synonym: {promethium}, {Pm},
{atomic number 61}]
3: the person who holds the position of head of the government
in the United Kingdom [synonym: {Prime Minister}, {PM},
{premier}]
4: modulation of the phase of the carrier wave [synonym: {phase
modulation}, {PM}]