 As I read, I underline terms that appear unfamiliar as I go. But I don't have time to look up every single word I don't understand because not every word is relevant. Instead, I focus on looking for vocabulary that will help me understand the topic. For example, when I notice that I'm underlining the same word several times, I'll circle it instead and make a note in the margins so I don't forget about it later on. Another way to identify important terminology is to consider where it is found in the text. If the term appears in the title, the thesis statement, or the description of another key concept, I'll make sure to also highlight this as a keyword to look up later. Once I find the terms I want to define, where I look will depend on the nature of the reading material. For example, if I'm reading a scientific article, I use Google Scholar to find other articles that address the same concept in another way.