par excellence (Fr.). By way of eminence; preëminently.
pari passu (L.). With equal pace; step for step.
particeps criminis (L.). Accomplice in a crime.
parvenu (Fr.). An upstart.
passim (L.). Everywhere.
pax vobiscum (L.). Peace be with you.
per capita (L.). By the head; on each person.
per se (L.). By itself considered; of itself.
poeta nascitur, non fit (L.). A poet is born, not made.
pour prendre congé (Fr.). To take leave.