名詞 p.m.:

1. an examination and dissection of a dead body to determine cause of death or the changes produced by disease
   同義詞：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
   同義詞：promethium, Pm, atomic number 61
3. the person who holds the position of head of the government in England
   同義詞：Prime Minister, PM, premier
4. modulation of the phase of the carrier wave
   同義詞：phase modulation, PM

形容詞 p.m.:

1. after noon
   同義詞：post meridiem, pm

副詞 p.m.:

1. between noon and midnight
   同義詞：post meridiem, PM