I have been thinking about this a lot, since joining Locals. There are two approaches to this, in the common vernacular. First, the naive answer, which is that a community is roughly synonymous with a professional affiliation or a social association. Like being a member of a legal bar, or being a “Cubs Fan”, or an alumnus of some university. Second, there are the sociological definitions, which distill “community” into a set of shared abstract properties, like “interests” or demographic characteristics, such as the “community of python developers”, or the “LGBT community”.