This is the 1683rd most frequent French word.
jeudi
Thursday.
Here, 'jeudi' is used as a specific day of the week to indicate when the activity of going to the market occurred.
Nous sommes allés au marché le jeudi.
We went to the market on Thursday.
Here, 'jeudi' is modified by the adjective 'dernier' to refer specifically to the Thursday of the previous week.
Jeudi dernier, nous avons regardé un film.
Last Thursday, we watched a movie.
Here, 'jeudi' is used to indicate a recurring weekly event happening on Thursdays, clarified by the adverb 'chaque'.