From this point of vantage, we were able to gain an impression of the massive outlines of the main structure, and its intricate maze of girders.1950 March, H. A. Vallance, “On Foot Across the Forth Bridge”, in Railway Magazine, page 149:
3
A sketch or drawing in which objects are delineated in contours without shading.
Painters, by their outlines, colours, lights, and shadows, represent the same in their pictures.1695, C[harles] A[lphonse] du Fresnoy, translated by John Dryden, De Arte Graphica. The Art of Painting, […], London: […] J[ohn] Heptinstall for W. Rogers, […], →OCLC:
4
A general description of some subject.
5
A statement summarizing the important points of a text.
6
A preliminary plan for a project.
the outline of a speech
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Broadcasting, Film, Media, Television A prose telling of a story intended to be turned into a screenplay; generally longer and more detailed than a treatment.
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Fishing, Hobbies, Lifestyle A setline or trotline.
He stood transfixed before the unaccustomed view of London at night time, a vast panorama which reminded him […] of some wood engravings far off and magical, in a printshop in his childhood. They dated from the previous century and were coarsely printed on tinted paper, with tinsel outlining the design.1963, Margery Allingham, “Foreword”, in The China Governess: A Mystery, London: Chatto & Windus, →OCLC:
2
To summarize.
Wikipedia items featuring books usually outline them after giving their background.
At her invitation he outlined for her the succeeding chapters with terse military accuracy ; and what she liked best and best understood was avoidance of that false modesty which condescends, turning technicality into pabulum.1907 August, Robert W[illiam] Chambers, chapter VIII, in The Younger Set, New York, N.Y.: D. Appleton & Company, →OCLC:
3
Computing, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences, Software compilation To optimize for size by replacing repeated code fragments with function calls.