Sentence:  Could a linguist, could a grammarian, could even a mathematician have seen what she did, have witnessed their appearance together, and heard their history of it, without feeling that circumstances had been at work to make them peculiarly interesting to each other?—How much more must an <WSD>imaginist</WSD>, like herself, be on fire with speculation and foresight!—especially with such a groundwork of anticipation as her mind had already made. 
Meaning of the word marked with <WSD> tags:  An imaginative person.