Sentence:  Multi-dimensional option pricing becomes an important topic in financial markets (Franker et al., 2008). Among which, the American-type derivative (e.g. the <WSD>Bermudan</WSD> option) pricing is a challenging problem. 
Meaning of the word marked with <WSD> tags:  (of an option) Can be exercised on specific dates between the issue date and the expiry date.