Promissio parit debitum - What's promised is owed (Philosophical term - don't let your mouth write a check that your butt can't cash)
Promoveatur ut amoveatur - Promoted to get him out of the way (To remove someone who is causing problems. Also known as "Promoveatur ut removeatur")
Pronuntiatio restituta - Pronunciation restored (Articulation of the Latin language as it was classic time)
Propaganda Fide - To propagate the faith (Congregation founded in 1622 by Pope Gregory XV to spread Christianity)
Propia Persona - For Oneself (Legal term - Representing oneself in court without a lawyer or additional legal representation - Thank you: Kofi )
Propino tibi salutem! - I salute you before drinking! (Cheers!)
Proprio marte - On its own initative
Propter libidinem - Because of lust (Ecclesiastical term - Thomas Aquinas used this argument to explain that if the priest was a woman, the faithful (men) would get sexually excited)
Propter nuptias - Proper nuptials (Also the expression donation propter nuptias> in reference to the donation parents made to their children wedding)
Prosit - Cheers (Ecclesiastical term - after a meal and after the priests after Mass)
Protestatio servat ius protestantis - The protest preserves the rights of those who protest
Provida mater Ecclesia - Provident Mother Church (Ecclesiastical term - Apostolic Constitution of Pope Pius XII)
Proximus sum egomet mihi - Charity begins at home (Terence)
Psalteria rhythmica - Rhythms of Psalms
Publicum ius est quod ad statum rei romanae spectat; privatum, quod ad singulorum utilitatem - Public law is looks over to the state of the Roman Republic; private, which looks over the good of the individual (Legal term in ancient Rome)
Puella dominicana, feria secunda non Amat - Sunday girl does not love Mondays
Puella improba, parvum improbus - Bad girl, boy bad
Puer natus est nobis - A child is born to us (Ecclesiastical term - Introit of the third Mass on Christmas)
Puer natus in Bethleem - A child is born in Bethlehem (Ecclesiastical term)
Puer qui adest piger est - The child who is present, is lazy (He is not studying Latin hard enough)
Pueri Hebraeorum - Jewish Children (Ecclesiastical term - Antiphon in the procession of the palms on Palm Sunday)
Pueri pueri, pueri puerilia tractant - Kids will be kids and will be naughty
Pulchra leonina - The beautiful lioness (Motto and popular name of the Lion Cathedral in Spain)
Pulchra sunt quae visa placent - Beautiful are the things that please the eye