Sentence:  generous public provision for the infirm ; democratic and secret elections of all officers including priests , meals taken publicly in common refectories ; a common habit or uniform prescribed for all citizens ; even houses changed <WSD>once</WSD> a decade ; six hours of manual labor a day for all but a handful of magistrates and scholars , and careful measures to prevent anyone from shirking ; no private property , no money ; no sort of pricing at all for any goods or services , and therefore no market in the economic sense of the term . 
Meaning of the word marked with <WSD> tags:  on one occasion