Sentence:  In all his miscalculations , Stravinsky made the fatal historical blunder of <WSD>presuming</WSD> that he could transform other composers ' inspirations - representing many peoples , time periods and styles - into his own music by warping the harmony , melody , or form , to verify his own experiments . 
Meaning of the word marked with <WSD> tags:  take to be the case or to be true; accept without verification or proof