1.  pm(n = noun.act) autopsy, necropsy, post-mortem, post-mortem examination, postmortem, postmortem examination - an examination and dissection of a dead body to determine cause of death or the changes produced by disease; Array
is a kind of examination, scrutiny

2.  pm(n = noun.substance) atomic number 61, promethium - 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; Array
is a kind of metal, metallic element

3.  pm(n = noun.person) premier, prime minister - the person who holds the position of head of the government in the United Kingdom; Array
is a kind of chief of state, head of state
is a member of british cabinet

4.  pm(n = noun.communication) phase modulation - modulation of the phase of the carrier wave; Array
is a kind of modulation

pm, abbr.
1 Prime Minister.
2 post-mortem.
3 Provost Marshal.

pm, symb. Chem. the element promethium.