Okay kiddo, let's talk about a lady named Barbara Partee. She is a really smart lady who studies language and how we use it to communicate with each other. You know how we use words to talk to each other? Well, Barbara studies that a lot and tries to figure out how we understand what each other are saying.
She realized that sometimes, when we use words, they can have more than one meaning. For example, the word "bank" could mean a place where you keep your money, or it could mean the side of a river. Barbara called these different meanings "semantic ambiguity".
She also figured out that sometimes when we use words, we can leave out some important information and assume that the person we are talking to knows what we mean. Barbara called this "presupposition".
Overall, Barbara Partee is a really smart lady who helps us understand how language works and how we can communicate better with each other.