A bene placito - At one's pleasure
  A capite ad calcem - From head to heel
  A cappella - In church [style] - i.e. Vocal music only
  A contrario - From a contrary position
  A cruce salus - From the cross comes salvation
  A Deo et Rege - From God and the King
  A fortiori - With yet stronger reason
  A fronte praecipitium a tergo lupi - A precipice in front, wolves behind (between a rock and a hard place)
  A mari usque ad mare - From sea to sea (Motto of Canada)
  A mensa et thoro - From board and bed (legal separation)
  A pedibus usque ad caput - From feet to head
  A posse ad esse - From possibility to actuality
  A posteriori - From what comes after. Inductive reasoning based on observation, as opposed to deductive, or a priori
  A priori - From what comes before
  A verbis ad verbera - From words to blows
  Ab absurdo - From the absurd (establishing the validity of your argument by pointing out the absurdity of your opponent's position)
  Ab aeterno - From the beginning of time
  Ab asino lanam - Wool from an ass, blood from a stone impossible
  Ab hinc - From here on
  Ab imo pectore - From the bottom of the chest. (from the heart) (Julius Caesar)
  Ab incunabulis - From the cradle
  Ab initio - From the beginning
  Ab intestato - Having made no will
  Ab origine - From the origin
  Ab ovo usque ad mala - From the egg right to the apples (From start to finish) (Horace)
  Ab ovo - From the egg
  Ab urbe condita - From the foundation of the city. (Rome)
  Ab/Ex uno disce omnes - From one person, learn all people
  Abiit, excessit, evasit, erupit - He has left, absconded, escaped and disappeared
  Absente reo - In absence of the defendant
  Absit invidia - No offence intended
  Absit omen - May the omen be absent. (may this not be an omen)
  Absum! - I'm outta here!
  Abusus non tollit usum - Wrong use does not preclude proper use
  Abutebaris modo subjunctivo denuo - You've been misusing the subjunctive again
  Abyssus abyssum invocat - Hell calls hell; one mistep leads to another
  Accipere quam facere praestat injuriam - It is better to suffer an injustice than to do an injustice
  Acta est fabula, plaudite! - The play is over, applaud! (Said to have been emperor Augustus' last words)
  Acta non verba - Action not words
  Acta sanctorum - Deeds of the saints
  Actus reus - Wrongful act - as opposed to mens rea - the wrongful intention or guilty mind
  Ad absurdum - To the point of absurdity
  Ad acta - To archives. Not actual any more
  Ad alta - To the summit
  Ad astra per aspera - To the stars through difficulty
  Ad astra - To the stars
  Ad augusta per angusta - To high places by narrow roads
  Ad captandum vulgus - To appeal to the crowd -- often used of politicians who make false or insincere promises appealing to popular interest
  Ad clerum - To the clergy
  Ad eundem gradum - To the same level
  Ad eundem - Of admission to the same degree at a different university
  Ad eundum quo nemo ante iit - To boldly go where no man has gone before
  Ad fontes - To the sources (motto of Renaissance Humanism)
  Ad fundum - To the bottom / To the end (said during a generic toast, like bottoms up!)
  Ad hoc - For a particular purpose. (improvised, made up in an instant)
  Ad hominem - Appealing to a person's physical and emotional urges, rather than her or his intellect
  Ad honorem - In honour. Honour not baring any material advantage
  Ad idem - Of the same mind
  Ad infinitum - To infinity without end
  Ad interim - For the meantime
  Ad libitum (Acronym 'ad lib') - At one's pleasure
  Ad Libitur - As Desired
  Ad limina apostolorum - To the thresholds of the Apostles
  Ad litem - For a lawsuit or action
  Ad locum - At the place
  Ad lucem - Towards the light (motto of the University of Lisbon)
  Ad maiorem dei gloriam (AMDG) - For the greater glory of God
  Ad multos annos - To many years!, i.e. Many happy returns!
  Ad nauseum - To the point of making one sick
  Ad perpetuam rei memoriam - For the perpetual remembrance of the thing
  Ad praesens ova cras pullis sunt meliora - Eggs today are better than chickens tomorrow (a bird in the hand is worth two in the bush)
  Ad referendum - Subject to reference
  Ad rem - To the point
  Ad valorem - By the value, e.g. Ad valorem tax
  Ad vitam aeternam - For all time
  Ad vitam paramus - We are preparing for life
  Ad vitam - For life
  Addendum - A thing to be added
  Adeste Fideles - Be present, faithful ones
  Adsum - Here! present!
  Adversus incendia excubias nocturnas vigilesque commentus est - Against the dangers of fires, he (Augustus) conceived of the idea of night guards and watchmen
  Adversus solem ne loquitor - Don't speak against the sun (don't waste your time arguing the obvious)
  Advocatus diaboli - The devil's advocate
  Aegrescit medendo - The disease worsens with the treatment. The remedy is worse than the disease
  Aegri somnia - A sick man's dreams (Horace)
  Aegroto, dum anima est, spes esse dicitur - It is said that for a sick man, there is hope as long as there is life
  Aequam memento rebus in arduis servare mentem - Remember when life's path is steep to keep your mind even. (Horace)
  Aeronavis abstractio a prestituto cursu - Hijacking
  Aetatis (aet.) - Age
  Aeternum vale - Farewell forever
  Affidavit - A sworn written statement usable as evidence in court
  Age quod agis - Do what you do well, pay attention to what you are doing
  Age. Fac ut gaudeam - Go ahead. Make my day!
  Agenda - Things to be done
  Agnus Dei - The Lamb of God
  Aio, quantitas magna frumentorum est - Yes, that is a very large amount of corn
  Alea iacta est - The die has been cast. (Caesar)
  Alias - Otherwise
  Alibi - Elsewhere
  Aliena nobis, nostra plus aliis placent - Other people's things are more pleasing to us, and ours to other people. (Publilius Syrus)
  Alis volat propiis - She flies with her own wings (state motto of Oregon)
  Alma Mater - Nourishing mother. (One's old school or university)
  Alter ego - Other 'I' or 'Other Self'
  Alter ipse amicus - A friend is another self
  Alterum ictum faciam - I'm going to take a mulligan
  Altissima quaeque flumina minimo sono labi - The deepest rivers flow with the least sound. (still waters run deep)
  Alumnus - Nursling (former pupil)
  Amantes sunt amentes - Lovers are lunatics
  Amantium irae amoris integratio est - The quarrels of lovers are the renewal of love. (Terence)
  Amare et sapere vix deo conceditur - Even a god finds it hard to love and be wise at the same time
  Amat victoria curam - Victory favors those who take pains
  Amicitiae nostrae memoriam spero sempiternam fore - I hope that the memory of our friendship will be everlasting. (Cicero)
  Amicule, deliciae, num is sum qui mentiar tibi? - Baby, sweetheart, would I lie to you?
  Amicus certus in re incerta cernitur - A true friend is discerned during an uncertain matter
  Amicus curiae - Friend of the court
  Amicus humani generis - A friend of the human race (philanthropist)
  Amicus verus est rara avis - A true friend is a rare bird
  Amor animi arbitrio sumitur, non ponitur - We choose to love, we do not choose to cease loving. (Syrus)
  Amor caecus est - Love is blind
  Amor est vitae essentia - Love is the essence of life. (Robert B. Mackay)
  Amor ordinem nescit - Love does not know order. (St. Jerome)
  Amor patriae - Love of country
  Amor platonicus - Platonic love
  Amor tussisque non celantur - Love, and a cough, are not concealed. (Ovid)
  Amor vincit omnia - Love conquers all. (Virgil)
  Amoto quaeramus seria ludo - Joking aside, let us turn to serious matters. (Horace)
  An nescis, mi fili, quantilla sapientia mundus regatur? - Don't you know then, my son, how little wisdom rules the world?
  Anguis in herba - A snake in the grass. A treacherous person. (Vergil)
  Anicularum lucubrationes - Old wives' tales
  Animadvertistine, ubicumque stes, fumum recta in faciem ferri? - (At a barbeque) Ever noticed how wherever you stand, the smoke goes right into your face?
  Animis opibusque parati - Prepared in minds and resources (ready for anything)
  Animus facit nobilem - The spirit makes (human) noble
  Anno (an.) - Year
  Anno domini (AD) - In the year of the Lord
  Anno hegirae (AH) - In the year of the hegira
  Anno mundi - In the year of the world
  Anno regni - In the year of reign
  Anno urbis conditae (AUC) - From the year of founding of the city (Rome)
  Annuit coeptis - God has favored us
  Annus bisextus - Leap year
  Annus horribilis - A horrible year
  Annus mirabilis - Year of wonders
  Ante litteram - Before the letter
  Ante meridiem (a.m.) - Before midday
  Ante mortem - Before death
  Ante prandium (A.p.) - Before a meal
  Ante - Before
  Antebellum - Before the war
  Antiquis temporibus, nati tibi similes in rupibus ventosissimis exponebantur ad necem - In the good old days, children like you were left to perish on windswept crags
  Anulos qui animum ostendunt omnes gestemus! - Let's all wear mood rings!
  Apage Satanas - Begone, Satan
  Appareo Decet Nihil Munditia? - Is It Not Nifty?
  Apudne te vel me? - Your place or mine?
  Aqua fortis - Nitric acid
  Aqua pura - Pure water
  Aqua vitae - Water of life (brandy)
  Aquila non captat muscas - The eagle doesn't capture flies (don't sweat the small things)
  Arbiter elegantiae - Judge in matters of taste
  Arcana imperii - Secrets of the empire
  Arduum sane munus - A truly arduous task
  Arguendo - For the sake of argument
  Argumentum ad hominem - An argument against the man. Directing an argument against an opponent's character rather than the subject at hand
  Argumentum ad ignorantiam - Arguing from ignorance
  Armis Exposcere Pacem - They demanded peace by force of arms. (An inscription seen on medals)
  Ars gratia artis - Art for art's sake. (motto of MGM)
  Ars longa, vita brevis - Art (work) is long, but life is short
  Ars sine scienta nihil est - Art without science is nothing. (I would also claim that the opposite is true)
  Artium baccalaureus - Bachelor of Arts (BA)
  Artium magister - Master of Arts (MA)
  Ascendo tuum - Up yours
  Asinus asinum fricat - The ass rubs the ass. (Conceited people flatter each other about qualities they do not possess)
  Aspice, officio fungeris sine spe honoris amplioris - Face it, you're stuck in a dead end job
  Aspirat primo Fortuna labori - Fortune smiles upon our first effort. (Virgil)
  Assiduus usus uni rei deditus et ingenium et artem saepe vincit - Constant practice devoted to one subject often outdues both intelligence and skill. (Cicero)
  Astra inclinant, non necessitant - The stars incline; they do not determine
  Astra non mentiuntur, sed astrologi bene mentiuntur de astris - The stars never lie, but the astrologs lie about the stars
  Aude sapere - Dare to know
  Audaces fortuna iuvat - Fortune favors the bold. (Virgil)
  Audere est facere - To dare is to do. (Motto of Tottenham Hotspur)
  Audi et alteram partem - Hear the other side too
  Audiatur et altera pars! - Let us hear the opposite side!
  Audio, video, disco - I hear, I see, I learn
  Auget largiendo - He increases by giving liberally
  Aura popularis - The popular breeze. (Cicero)
  Aurea mediocritas - The golden mean. (an ethical goal; truth and goodness are generally to be found in the middle.) (Horace)
  Auribus tenere lupum - I hold a wolf by the ears. (I am in a dangerous situation and dare not let go.) (Terence)
  Aurora australis - The Southern lights
  Aurora borealis - The Northern lights
  Aurora Musis amica - Dawn is friend of the muses. (Early bird catches the worm.)
  Aut Caesar aut nihil - Caesar or nothing i.e., all or nothing
  Aut disce aut discede - Either learn or leave
  Aut insanit homo, aut versus facit - The fellow is either mad or he is composing verses. (Horace)
  Aut viam inveniam aut faciam - I will either find a way or make one
  Aut vincere aut mori - Either conquer or die
  Auxilio ab alto - By help from on high
  Avarus animus nullo satiatur lucro - A greedy mind is satisfied with no (amount of) gain
  Ave atque vale - Hail and farewell. (Catullus)
  Ave caesar! Morituri te salutamus - Hail Caesar! We who are about to die salute you. (gladiators before the fight)
  Ave maria - Hail Mary