This is the 2541st most frequent French word.
dans
"In" or "within" (used to indicate location or position).
In this sentence, 'dans' is used to indicate location or the containment inside a place, specifying where the book is found (within the library).
Il y a un livre dans la bibliothèque.
There is a book in the library.
Here, 'dans' is used to refer to time, signifying an event or action happening in the future within a time span (five days).
Le devoir est dans cinq jours.
The homework is in five days.
In this sentence, 'dans' is used to describe the timing related to an activity, placing the action (watching a movie) within the duration of the evening.