Orator fit, poeta nascitur.—The orator is made by education, but a poet must be born.
Ore rotundo.—With full-sounding voice.
Otium cum dignitate.—Dignified leisure.
Outré.—Preposterous; eccentric.
Oyer and Terminer.—A criminal court.
Pallida mors.—Pale death.
Par excellence.—By way of eminence.
Par nobile fratrum.—A noble pair of brothers; two just alike.
Pari passu.—With equal step; in the same degree.