Sentence:  `` Uncle Sam '' was , indeed , a rich uncle to Prokofieff , in those opulent , post-war victory <WSD>years</WSD> of peace and prosperity , bold speculations and extravaganzas , enjoyment and pleasure : `` The Golden Twenties '' . 
Meaning of the word marked with <WSD> tags:  a period of time containing 365 (or 366) days