Sentence:  Sadie studied piano ; played Chopin in the `` Soiree Musicale of Mr. Guthrie 's Pupils '' ; and she recited `` Hector 's Farewell to Andromache '' most movingly , to the <WSD>special</WSD> delight of Rabbi Jastrow at his home in Germantown near Philadelphia , where the Szold girls took turns visiting between the visits of the Jastrow boys at the Szolds ' in Baltimore . 
Meaning of the word marked with <WSD> tags:  unique or specific to a person or thing or category