outline /ˈaʊtˌlaɪn/ noun
1 a [count] : a drawing or picture that shows only the shape of an object — often followed by of
1 b [noncount] : a style of drawing in which only the outer edges of an object are shown
2 [count] : a line that is drawn around the edges of something
3 : [count] a written list or description of only the most important parts of an essay, speech, plan, etc.
[noncount]