_nom de plume_ (Fr.). A pen name. (Incorrect for _nom de guerre_.)
_non compos mentis_ (L.). Not of sound mind.
_non omnia possumus omnes_ (L.). We cannot, all of us, do everything.
_omnia vincit amor_ (L.). Love conquers all things.
_onus probandi_ (L.). The burden of proof.
_o tempora! o mores!_ (L.). Alas for the times! Alas for the manners!
_otium cum dignitate_ (L.). Ease with dignity.
_Pace_ (L.). Not to give offence to. -- _pace tua_, with your consent.
_palmam qui meruit ferat_ (L.). Let him who has won the palm wear it.
_par excellence_ (Fr.). By way of eminence; preëminently.
_pari passu_ (L.). With equal pace; step for step.
_particeps criminis_ (L.). Accomplice in a crime.
_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.
_prima facie_ (L.). On the first face; at first sight.
_pro aris et focis_ (L.). For our altars and hearths.
_pro bono publico_ (L.). For the good of the public.
_protégé_ (Fr.). One protected by another.
_Quantum mutatus ab illo_ (L.). How changed from what he once was.
_quantum sufficit_ (L.). As much as suffices; a sufficient quantity.
_quelque chose_ (Fr.). Something; a trifle.
_quid pro quo_ (L.). Something in return; an equivalent.
_quod erat demonstrandum_ (L.). Which was to be proved.
_quot homines, tot sententiae_ (L.). Many men, many minds.
_Raison d'être_ (Fr.). The reason for a thing's existence.
_reductio ad absurdum_ (L.). Reduction to an absurdity.
_requiescat in pace_ (L.). May he, she, rest in peace.
_revenons à nos moutons_ (Fr.). Let us return to our sheep; let us return to our subject.
_sans peur et sans reproche_ (Fr.). Without fear and without reproach.
_sartor resartus_ (L.). The tailor patched or mended.
_sauve qui peut_ (Fr.). Let him save himself who can.
_savoir faire_ (Fr.). The knowing how to act; tact.
_semper idem;--paratus_ (L.). Always the same, always ready.
_sic semper tyrannis_ (L.). Ever so to tyrants.
_sic transit gloria mundi_ (L.). Thus passes away the glory of this world.
_similia similibus curantur_ (L.). Like things are cured by like.
_si monumentum quæris, circumspice_ (L.). If you seek his monument, look around you.