From Longman Business DictionaryBlack-Scholes option pricing modelBlack-Scholes option pricing model /ˌblæk skəʊlz ˈɒpʃən ˌpraɪsɪŋ ˌmɒdl-skoʊlz ˈɑːpʃən ˌpraɪsɪŋ ˌmɑːdl/ [singular]FINANCE a mathematical way of finding out if an OPTION (=the right to buy shares in the future at a particular price) has a fair price, taking into account the price of the related shares, the amount that this price has changed over time, interest rates, the risk of the agreement failing etc → model