In fragantia poesis abditus - In fragrance hidden poetry
In globo - Globally (In mass)
In hoc signo vinces - In this sign you will conquer (The Roman Emperor Constantine became a Christian after he dreamed of a cross and those words in Greek: Εν Τουτω Νικα. He won many battles after his soldiers painted crosses in their armors and shields)
In Humilitate Vincis - In humility you will conquer (Motto del Rugby Club of the Metropolitan University in Caracas, Venezuela)
In ictu oculi - In the blink of an eye
In illo tempore - At that time
In integrum - Integral (Legal term)
In itinere - During the journey (Legal term - Something that happens during the fact)
In ius vocatio - Call for justice (Legal term)
In lacrimas Liqui - Break and cry
In Libertatem Vocati - You have been called unto liberty (Vulgate - Galatians 5, 13)
In limine litis - At the beginning of the process Legal term)
In loco parentis - In lieu of parents (Legal Term - often used in Family Court to assign parental responsibilities often on non-biological parental substitutes/parties - Thank you: crj)
In Lumine Sapientia - Wisdom is in the light (Motto of the Almeria University in Spain)
In maculisi - Immaculate
In magnis et voluisse satis est - To once have wanted is enough in great deeds (Propertius)
In media res - In the middle of things (Literary technique where the narrative starts in the middle of the story)
In medio stat virtus - The virtue is in the middle
In mediu virtuas - The truth is in the middle (Legal term - neither party is right)
In melo veritate reperimus - In the melody we find the truth
In mente - In the mind
In natura veritas - Truth is in nature
In naturalibus - Naked
In necesariis unitas, in dubiis libertas, in omnibus caritas - In certain things unity, in doubtful things liberty, in all things charity (Augustin)
In nobis vivus manes - The ghosts live within ourselves