Definitely my meaning is "summary". I wouldn't say "gist" as that word tends connote something about vagueness. But Wikipedia literally can't contain all knowledge for a number of reasons. And an encyclopedia is not, for example, a text book. And our entry on "China" for example really shouldn't be 10,000 pages long. It should provide a summary of what is known, and refer people to other sources to dig deeper. Where to stop is of course a very interesting question subject to thoughtful discussion - and of course Wikipedia can be (and is) much more comprehensive than traditional encyclopedias.