In 1.1 Iago and Roderigo are talking to each other. Iago is telling Roderigo how Othello promoted a guy over him who has no military experience, then he tells Roderigo that Desdemona is going to be marrying Othello who is a moor. Then they both go to her fathers house and tell him that she is out with the moor (Othello) and the father gathers a search party to find her.
I came to this understanding by looking at the first word on the left page then reading till I got to that word. I would then read to the end of that line then read the definition/description then reread the line using the definition of the word in place of it. Sometimes I would have to reread the line a couple of times but I usually get it the first or second time.