the line by which a figure or object is defined or bounded; contour.
a drawing or sketch restricted to line without shading or modeling of form.
a general sketch, account, or report, indicating only the main features, as of a book, subject, or project: an outline of medieval history; an outline of a speech.
outlines, the essential features or main aspects of something under discussion: At the first meeting, we gave her only the outlines of the project.
Printing. an ornamented type in which the outside contours of each character appear in black, with the inside left white.
verb (used with object), outlined, outlining.
to draw the outline of, or draw in outline, as a figure or object.
to give an outline of; sketch the main features of: On the first day, the professor just outlined the course for us.

1655–65; out- + line1

preoutline, noun, verb (used with object), preoutlined, preoutlining.
reoutline, verb (used with object), reoutlined, reoutlining.
well-outlined, adjective

1. See form. 3. plan, draft, rough, synopsis, summary. 6, 7. delineate, draft.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
outline (ˈaʊtˌlaɪn)
1.  a preliminary or schematic plan, draft, account, etc
2.  (usually plural) the important features of an argument, theory, work, etc
3.  the line by which an object or figure is or appears to be bounded
4.  a.  a drawing or manner of drawing consisting only of external lines
 b.  (as modifier): an outline map
5.  to draw or display the outline of
6.  to give the main features or general idea of

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1662, "lines by which a figure is delineated," from out + line (v.). Meaning "rough draft in words" is from 1759. The verb is first attested 1790.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Bring brief handouts that outline your plan for the hour.
We could use a single sensor to look at the three-dimensional outline of a
  target or object of interest.
The cloud would outline your skin, delineate your lungs, trace your digestive
Scheduled events such as these give an outline of the global agenda.
Image for outline
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