Most of us feel comfortable using the word “group” without giving it much thought. In everyday use, it can be a generic term, although it carries important clinical and scientific meanings. Moreover, the concept of a group is central to much of how we think about society and human interaction. Often, we might mean different things by using that word. We might say that a group of kids all saw the dog, and it could mean 250 students in a lecture hall or four siblings playing on a front lawn. In everyday conversation, there isn’t a clear distinguishing use. So how can we hone the meaning more precisely for sociological purposes?