The Collaborative International Dictionary of English v.0.48:

Outline \Out"line`\, v. t. [imp. & p. p. Outlined; p. pr. &
   vb. n. Outlining.]
   1. To draw the outline of.
      [1913 Webster]

   2. Fig.: To sketch out or indicate as by an outline; to
      create a general framework of (a plan, system, discourse,
      course of thought), for which the details need to be
      added; as, to outline an argument or a campaign.
      [1913 Webster]