Sentence:  One finds , for example , that a terse and stereotyped verbal expression , seeming at first to be a mere hollow convention , reveals itself over the months of <WSD>therapy</WSD> as the vehicle for expressing the most varied and intense feelings , and the most unconventional of meanings . 
Meaning of the word marked with <WSD> tags:  (medicine) the act of caring for someone (as by medication or remedial training etc.)