See also “What did the Romans ever do for us?“

• Ad nauseam
• Ad hoc
• Status quo
• Etcetera
• QED (Quod erat demonstrandum)
• Per se
• De facto
• Persona non grata
• Bona fide
• Sui generis
• Sine qua non
• Ad infinitum
• Quid pro quo
• Mea culpa – the original “my bad”?
• Deus ex machina
• Alea iacta est – the die is cast (Caesar)
• Memento mori – remember you have to die
• Per ardua ad astra
• Reductio ad absurdum

Some with personal meaning –

• Ars longa vita brevis (motto of University of Sheffield Medical School)
• Concordia Parvae Res Crescunt (motto of Merchant Taylors’ School)

And some good ones I need to use more –

• In vino veritas – you are likely to get the truth when someone is drinking?
• Festina lente – hurry but slowly [Augustus]
• Audentes fortuna iuvat – fortune favours the bold (Pliny the Elder
  leaving Pompeii to rescue his friend – also in Aeneid)
• Si vis Amari ama – if you want to be loved, love (Seneca)
• Ubi amor, ibi dolor – where there is love, there is pain
• Magister dixit – the teacher has spoken
• Semper in execretum solum profundum variat? Always in shit, only the
  depth varies
• Omnia mea mecum porto – all that is mine I carry with me (ie
  character, intelligence)