Used to show when something occurs; the X on the timeline (Ex: she slept at night)
NO LATIN PREPOSITION USED (english prepositions used when translating are In, at, on)
“In” is regularly used to
Denote a time of life (Ex: In pueritia- In boyhood)
Denote an office held (Ex: In consulatu nostro- In my consulship)
Express a situation (Ex: In civili bello- in a civil war)
With a numeral (Ex: ter in anno- three times in a year)