This is the 119th most frequent Czech word.
pouze
"Pouze" means "only" in English.
In this sentence, 'pouze' emphasizes that the action of seeing happened only one time and no more.
Viděl jsem ho pouze jednou.
I saw him only once.
Here, 'pouze' limits the time frame of the shop's operation to weekdays.
Tento obchod je otevřen pouze od pondělí do pátku.
This shop is open only from Monday to Friday.
In this context, 'pouze' restricts the selection to a single option.