Excusez-moi ..: Excuse me...! (to ask for something)
Example: Excusez-moi. Could you please tell me where the library is?
Flagrante delicto: In the act
Example: The detective realized that without hard evidence he had no case; he would have to catch the culprit flagrante delicto.
Habeas corpus: You must have the body (in court); a court order instructing that a person under arrest be brought before a judge
Example: The right of habeas corpus has long been regarded as an important safeguard of individual liberty.
i.e. (id est): That is
Example: When you use i.e. in a sentence to signify "that is," you do follow it with a comma.
In loco parentis: In the place of a parent
Example: The court appointed a guardian for the children, to serve in loco parentis.
In medias res: In the middle of a sequence of occurences
Example: The film begins in medias res, with a panting, terrified man running through the night.
In Situ: Situated in the original or natural position
Example: I prefer seeing statues in situ rather than in the confines of a museum.
In vino veritas: In wine there is truth
Example: By the end of the party, several of the guests had made a good deal of their private lives public, prompting the host to murmur to his wife, 'in vino veritas.
Inter: Among, Between
Example: Inter is a Latin neuter plural, so it can only mean among other things, not people.
Interim: Meanwhile, interval
Example: The interim mayor did a good job while he was in office.
Intra: Within
Example: English play important roles in more use of intra-sentence conjunctions in legal translation.
Ipso Facto: By the fact itself
Example: An extremist, ipso facto, cannot become part of a coalition.
Magnum opus: A great work
Example: And from him we have immense amounts to learn, as Simon Schama's recent magnum opus vividly demonstrates.
Magnus: Big, Great, magnitude
Example: In Latin, Magnus is masculine, magna is feminine and magnum is neutral.
Mater: Mother
Example: She has a loving and much loved mater, grandma and great grandma.
Memento Mori: A reminder that you must die
Example: The skull rested on the mantlepiece as a memento mori.
Modus operandi: Mode of operating
Example: The serial killer's modus operandi is to stab the victim and let them bleed to death.
Ne Plus Ultra: The most intense degree of a quality or state
Example: Pulling it from the box, he realized he was face to face with the ne plus ultra of computers.
Opus Dei: The work of God
Example: The opus Dei prelature is governed world-wide by a prelate in Rome.
Per: According to; in accordance with
Example: If something happens as per normal, it means that it happens in the normal way.