Sentence:  We find also the ancient term "ārcūbālīstǎ" (or with "II",) which, with the aid of otosis, elision, and <WSD>heteronymy</WSD>, arising out of the varying use and changing shape of the weapon, will account for all the forms cited. 
Meaning of the word marked with <WSD> tags:  The condition of being heteronyms; the relationship between two words with different meanings and either the same spelling or the same pronunciation but not both.