Sentence:  <nowiki>[</nowiki>"Phancy," i.e. imagination, is] but an <WSD>amassment</WSD> of "imaginary conceptions, praejudices, ungrounded opinions," and infinite Impostures; 
Meaning of the word marked with <WSD> tags:  That which is amassed; a large quantity ("of" something).<ref>(Samuel Johnson), "(A Dictionary of the English Language)," London: W. Strahan, 1755: “A<small>MASMENT</small>. (...) A heap; an accumulation; a collection.”[https://babel.hathitrust.org/cgi/pt?id=ucm.5326809190&view=1up&seq=127&size=150]</ref>