Usage Note
Semaine is always feminine. En semaine means 'on weekdays' (as opposed to the weekend), and la semaine prochaine / dernière are the standard ways to say 'next / last week.' French work culture often references les 35 heures, the legislated 35-hour work week, making semaine de travail a culturally loaded phrase.
Examples
"Je pars en vacances la semaine prochaine."
Natural Translation
I'm going on holiday next week.

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