Legal Maxim's

Id est (i.e)
— That is.
Id quod commune est, nostrum esse dicitur
— That which is common is said to be ours.
Idem
— The same person or thing.
Idem nihil dicere et insufficienter dicere est
— It is the same to say nothing as not to say enough.
Ignorantia facti excusat, ignorantia juris non excusat
— Ignorance of fact excuses, ignorance of law does not excuse.
Imperium in imperio
— A sovereignty within a sovereignty.
Impotentia excusat legem
— Impossibility is an excuse in the law.
Impunitas semper ad deteriora invitat
— Impunity always leads to greater crimes.
In aequali jure melior est conditio possidentis
— When the parties have equal rights, the condition of the possessor is better.
In alta proditione nullus potest esse acessorius; sed principalis solum modo
— In high treason no one can be an accessory; but a principal only.
In Anglia non est interregnum
— In England there is no interregnum.
In camera
— In private.
In casu extremae necessitatis omnia sunt communia
— In a case of extreme necessity everything is common.
In criminalibus probationes debent esse luce clariores
— In criminal cases the proofs ought to be cleared than the light.
In curia domini regis, ipse in propria persona jura discernit
— In the Kings Court, the King himself in his own person dispenses justice.
In delicto
— At fault.
In esse
— In existence.
In extenso
— At full length.
In fictione legis aequitas existit
— A legal fiction is consistent with equity.
In foro conscientiae
— In the forum of conscience.
In futoro
— In the future.
In jure non remota causa sed proxima spectatur
— In law not the remote but the proximate cause is looked at.
In limine
— At the outset, on the threshold.
In loco parentis
— In place of the parent.
In mortua manu
— In a dead hand.
In novo casu novum remedium apponendum est
— In a new case a new remedy is to be applied.
In omni re nascitur res quae ipsam rem exterminat
— In everything is born that which destroys the thing itself.
In omnibus
— In every respect.
In pari delicto potior est conditio possidentis
— When the parties are equally in the wrong the condition of the possessor is better.
In personam
— Against the person.
In pleno
— In full.
In quo quis delinquit in eo de jure est puniendus
— In whatever thing one offends in that he is to be punished according to law.
In republica maxime conservanda sunt jura belli
— In a State the laws of war are to be especially observed.
In situ
— In its place.
In terrorem
— As a warning or deterrent.
In testamentis plenius testatoris intentionem scrutamur
— In wills we seek diligently the intention of the testator.
In traditionibus scriptorum non quod dictum est, sed quod gestum est, inspicitur
— In the delivery of writings (deeds), not what is said but what is done is to be considered.
In verbis, non verba sed res et ratio quaerenda est
— In words, not words, but the thing and the meaning are to be inquired into.
Indicia
— Marks, signs.
Injuria non excusat injuriam
— A wrong does not excuse a wrong.
Intentio inservire debet legibus, non leges intentioni
— Intention ought to be subservient to the laws, not the laws to the intention.
Inter alia
— Amongst other things.
Interest reipublicae res judicatas non rescindi
— It is in the interest of the State that things adjudged be not rescinded.
Interest reipublicae suprema hominum testamenta rata haberi
— It is in the interest of the State that mens last wills be sustained.
Interest reipublicae ut quilibet re sua bene utatur
— It is in the interest of the State that every one use properly his own property.
Interest reipublicase ut sit finis litium
— It is in the interest of the State that there be an end to litigation.
Interim
— Temporary, in the meanwhile.
Interpretare et concordare leges legibus est optimus interpretandi modus
— To interpret and harmonize laws is the best method of interpretation.
Interpretatio fienda est ut res magis valeat quam pereat
— Such a construction is to be made that the thing may have effect rather than it should fail.
Interruptio multiplex non tollit praescriptionem semel obtentam
— Repeated interruption does not defeat a prescription once obtained.
Invito beneficium non datur
— A benefit is not conferred upon one against his consent.
Ipsissima verba
— The very words of a speaker.
Ipso facto
— By that very fact.
Iter arma leges silent
— In war the laws are silent.