Interior intimo meo et superior summo meo - Higher than my highest and more inward than my innermost self ("The Lord is closer to us than we are to ourselves" Benedict XVI)
Interposita persona - An intermediary (Legal term - Sometimes refers to a front man used to disguise an unlawful transaction )
Interpretatio germanica - Interpretation of the Germans
Interpretatio graeca - Interpretation of the Greek
Interpretatio largo sensu - Interpreted in general (Legal term - as opposed to strictu sensu)
Interpretatio romana - Interpretation of the Romans
Interpretatio stricto sensu - Interpreted strictly (Legal term - as opposed to largo sensu)
Intra muros - Within the wall
Introibo ad altare dei - Enter the altar of god (Ecclesiastical term)
Intuitu pecuniae - In response to money (Legal term)
Intuitu personae - In consideration of the person (Legal term)
Intus Nero, foris Cato - Inside a Nero, outside a Cato (There is a difference between what the man appears to be, and who he really is)
Inventa lege, inventa fraude - Made law, made the trap
Inveterata consuetudo et opinio iuris seu necessitatis - Inveterate habit and the opinion or necessity of law (Legal term - Usually - Unwritten Laws and behavior that follows people constantly: conviction of those people that such behavior is mandatory)
Invidia festos dies non agit - Envy does not take days off, or does not save the holidays
Invita Minerva - Despite Minerva
Invito domino - Against the will of the owner (Legal term)
Invitus nemo rem cogitur defendere - Nobody will be forced to defend the object (Legal term - Domitius Ulpianus - Digest 50,17,156 - )
Iovis dies - The day of Jupiter (Thursday)
Iovis erepto fulmine, per inferna vehitur Promethei genus - Lightning taken from Jupiter transpors through hell the race of Prometheus. (Plaque erected at the opening of Subway in Paris)
Ipsa duce - She guides us (Ecclesiastical term - used religiously in reference to the Virgin Mary)
Ipsa natura rei - The very nature of things
Ipsa scientia potestas est - The knowledge itself is power
Ipsa senectus morbus est - Old age itself is a disease (Terence - Phormio)
Ipsae caprae memores redeunt in tecta - Even the goats remember their home (Publius Vergilius Maro - Georgics 3 316)