The gist, the essence, the major parts of something — that's its outline.
The origins of outline come from the artistic practice of marking a line around the outer edge of a person or shape in a picture before filling it in. Only later, in the 1800s, did it come to be applied to verbal descriptions, too. Technically an outline suggests a condensed form of something, but as any high school or college student knows, course outlines have a habit of being pretty darn long. In 1919 H.G. Wells wrote a book called An Outline of History. Its length? 1,324 pages.
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the line that appears to bound an object
trace the shape of
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a sketchy summary of the main points of an argument or theory
draw up an outline or sketch for something
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