Sentence:  But then one day , while on a week 's visit to the country home of a retired Swiss jeweler , <WSD>Rousseau</WSD> amused the company with a few little melodies he had written , to which he attached no great importance . 
Meaning of the word marked with <WSD> tags:  French philosopher and writer born in Switzerland; believed that the natural goodness of man was warped by society; ideas influenced the French Revolution (1712-1778)