Ibidem (Ib.) - In the same place. (in a book)

　　Id certum est quod certum reddi potest - That is certain that can be made certain

　　Id est (i.e.) - That is to say

　　Id est mihi, id non est tibi! - It is mine, not yours!

　　Id imperfectum manet dum confectum erit - It ain't over until it's over

　　Id tibi praebet speciem lepidissimam! - It looks great on you!

　　Idem quod (i.q.) - The same as

　　Idem - The same

　　Iesus Nazarenus Rex Iudaeorum (INRI) - Jesus of Nazareth, King of the Jews

　　Ignis aurum probat, miseria fortes viros - Life is not a bowl of cherries, or, literally, Fire tests gold; adversity tests strong men

　　Ignis fatuus - Foolish fire (will-o-the-wisp)

　　Ignorantia juris neminem excusat - Ignorance of the law excuses no one

　　Ignoratio elenchi - An ignorance of proof

　　Ignotus (ign.) - Unknown

　　Ille dolet vere, qui sine teste dolet - He mourns honestly who mourns without witnesses. (Martialis)

　　Ille mi par esse deo videtur - He seems to me to be equal to a god. (Catullus)

　　Illegitimis nil carborundum - Don't let the bastards grind you down

　　Illiud latine dici non potest - You can't say that in Latin

　　Illius me paenitet, dux - Sorry about that, chief

　　Imitatores, servum pecus! - Imitators, you slavish crowd! (Horace)

　　Imperator/Imperatrix (Imp.) - Emperor/Empress

　　Imperator - Emperor

　　Imperium et libertas - Empire and liberty. (Cicero)

　　Imperium in imperio - An empire within an empire, i.e. A fifth column, a group of people within an nation's territory who owe allegiance to some other leader

　　Imperium - Absolute power

　　Impossibilium nulla obligatio est - Nobody has any obligation to the impossible. (Corpus Iuris Civilis)

　　Imprimatur - Let it be printed

　　Imprimis - In first place

　　In absentia - In one's absence

　　In actu - In practice

　　In aere aedificare - Build (castles) in the air. (St. Augustine)

　　In aeternum - For eternity

　　In alio pediculum, in te ricinum non vides - You see a louse on someone else, but not a tick on yourself. (Petronius)

　　In articulo mortis - At the moment of death

　　In banco - On the bench

　　In camera - In private chamber

　　In capite - In chief

　　In cavda venenvm - In the tail [is the] poison. Watch out for what you don't see

　　In curia - In court

　　In dentibus anticis frustrum magnum spiniciae habes - You have a big piece of spinach in your front teeth

　　In distans - At a distance

　　In dubiis non est agendum - In dubious cases, you should not act

　　In dubio pro reo - In doubt in favor of the accused. If there is a doubt about guiltiness, the judgement has to be in favour of the accused

　　In dubio - In doubt

　　In esse - In existence

　　In excelsis - In the highest

　　In extenso - At full length

　　In extremis - In extremity

　　In fine - At the end

　　In flagrante delicto - In the very act of committing an offence

　　In forma pauperis - In the form of a poor person; in a humble or abject manner

　　In futuro - In the future

　　In gremio legis - In the protection of the law

　　In his ordo est ordinem non servare - In this case the only rule is not obeying any rules

　　In hoc signo vinces - In this sign, you will be victorious. (Eusebios)

　　In infinitum - To infinity; without end

　　In libris libertas - In books (there is) freedom

　　In limine - On the threshold, at the very outset

　　In loco parentis - In the place of a parent

　　In loco - In the place of

　　In magnis et voluisse sat est - To once have wanted is enough in great deeds. (Propertius)

　　In media res - In or into the middle of a sequence of events. (Horace)

　　In medias res - Into the midst of things

　　In medio stat virtus - Virtue stands in the middle. Virtue is in the moderate, not the extreme position. (Horace)

　　In medio tutissimus ibis - In the middle of things you will go most safe. (Ovid)

　　In memoriam - To the memory of

　　In necessariis unitas, in dubiis libertas, in omnibus caritas - In necessary things unity, in doubtful things liberty, in all things charity

　　In nomine Domini - In the name of the Lord

　　In nomine Patris et Filii et Spiritus Santi - In the name of the Father and of the Son and of the Holy Spirit

　　In nubibus - In the clouds

　　In nuce - In a nutshell

　　In omnia paratus - Prepared for all things

　　In ovo - In the egg

　　In pace, ut sapiens, aptarit idonea bello - In peace, like a wise man, he appropriately prepares for war

　　In pace - In peace

　　In pari materia - Of like kind

　　In partibus infidelium - In parts inhabited by unbelievers

　　In parvo - In miniature

　　In perpetuum - For ever

　　In personam - Against the person

　　In pleno - In full

　　In pontificalibus - In the proper vestments of a pope or cardinal

　　in posse - In possibility

　　In posterum - Till the next day

　　In praesenti - At the present time

　　In principio - In the beginning

　　In propria persona - In person

　　In puris naturalibus - Completely naked

　　In quaestione versare - To be under investigation

　　In re - Refering to

　　In rem - Against the matter (property)

　　In rerum natura - In the nature of things

　　In saecvla saecvlorvm - For ages of ages forever

　　In se - In itself

　　In silico - By means of a computer simulation

　　In silvam ne ligna feras - Don't carry logs into the forest. (Horace)

　　In situ - In position

　　In specie - In kind; (a) in its own form and not in an equivalent (b) in coins and not in paper money

　　In spiritu et veritate - In spirit and truth. (Versio Vulgata)

　　In statu quo - In the same state

　　In terrorem - As a warning; in order to terrify others

　　In totidem verbis - In so many words

　　In toto - As a whole, absolutely, Completely

　　In transitu - In passing, on the way

　　In usu - In use

　　In utero - In the womb

　　In vacuo - In a vacuum or empty space

　　In vinculis etiam audax - In chains yet still bold (free)

　　In vino veritas - The truth is in wine. (A drunk person tells the truth)

　　In virtute sunt multi ascensus - There are many degrees in excellence. (Cicero)

　　In vitro - In a test tube (literally glass)

　　In vivo - In the living (thing)

　　Incipit - Begin here

　　Incredibile dictu - Incredible to say

　　Index librorum prohibitorum - Official list of forbidden books not to be read by Catholics

　　Indulgentiam quaeso - I ask your indulgence

　　Infinitus est numerus stultorum - Infinite is the number of fools

　　Infra dignitatem (dig.) - Undignified; beneath one's dignity

　　Infra - Below, underneath

　　Inhumanitas omni aetate molesta est - Inhumanity is harmful in every age. (Cicero)

　　Iniqua nunquam regna perpetuo manent - Stern masters do not reign long. (Seneca Philosophus)

　　Iniuria non excusat iniuriam - One wrong does not justify another

　　Insanabile cacoethes scribendi - An incurable passion to write. (Juvenal)

　　Insculpsit - He/she engraved it

　　Instrumentum aeri temperando - Airconditioner

　　Insula gilliganis - Gilligan's Island

　　Integer vitae scelerisque purus - Blameless of life and free from crime

　　Intellectum valde amat - Love the intellect strongly. (St. Augustine)

　　Intelligenti pauca - Few words suffice for he who understands

　　Intelligo me intelligere - I understand that I understand. (St. Augustine)

　　Inter alia - Among other things

　　Inter alios - Amongst other people

　　Inter arma silent leges - In time of war, laws are silent

　　Inter caecos regnat strabo - Among blinds the squinting rules. (Erasmus)

　　Inter caesa et porrecta - There's many a slip twixt cup and lip

　　Inter canum et lupum - Between a dog and a wolf

　　Inter nos - Between ourselves

　　Inter partes - Made between two parties

　　Inter se - Between themselves

　　Inter spem et metum - Between hope and fear

　　Inter vivos - Between living (people)

　　Interdum feror cupidine partium magnarum europe vincendarum - Sometimes I get this urge to conquer large parts of Europe

　　Interfice errorem, diligere errantem - Kill the sin, love the sinner. (St. Augustine)

　　Interregnvm - Period between rules anarchy, lawlessnes

　　Intra muros - Within the walls

　　Intra vires - Within the power

　　Inventas vitam iuvat excoluisse per artes - Let us improve life through science and art. (Vergil)

　　Ipsa qvidem pretivm virtvs sibi - Virtue is its own reward

　　Ipsa scientia potestas est - Knowledge itself is power. (Bacon)

　　Ipsi dixit - He himself said it. (Cicero)

　　Ipsissima verba - The exact words

　　Ipso facto - By that very fact

　　Ipso iure - By operation of the law

　　Ira furor brevis est - Anger is a brief insanity. (Horace)

　　Ire fortiter quo nemo ante iit - To boldly go where no man has gone before. (Star Trek)

　　Isto pensitaris? - You get paid for this crap?

　　Ita erat quando hic adveni - It was that way when I got here

　　Ita est - Yes./It is so

　　Ite, misse est - Go, the Mass is finished

　　Iubilate Deo - Rejoice in God

　　Iunctis viribus - By united efforts

　　Iure divino - By divine law

　　Iure humano - By human law

　　Ius civile - Civil law

　　Ius gentium - The law of nations

　　Ius primae noctis - The right of the first night

　　Ivs est ars boni et aeqvi - Law is the art of the good and the just

　　Ivs gentivm - Right of tribes law of nations