This is the 1764th most frequent Spanish word.
semana
Week.
The word 'semana' is used as a noun referring to a specific time period, specifically the past week.
La semana pasada fui al cine.
Last week I went to the cinema.
Here, 'semana' signifies a duration marked by a continuous period of seven days, emphasizing the ongoing activity.
Trabajaré durante toda la semana en este proyecto.
I will work during the entire week on this project.
In this case, 'semana' is pluralized to 'semanas', referring to multiple weeks within a given time frame described by the season of spring.