outline
n. countable B2 Upper Intermediate Oxford US //ˈaʊtˌɫaɪn// UK //ˈaʊtlaɪn// out·line
n. a short description of the main points of a plan or story. It can also mean the shape or edge of something.
n. a general description or plan giving the essential features of something but not the detail. Also refers to the line or set of lines enclosing or indicating the shape of an object.
She wrote a brief outline of her essay before starting.
The director presented a detailed outline of the script to the producers to secure funding for the film.
The mountain range appeared as a jagged black outline against the fading light of the sunset, providing a stark contrast to the vibrant orange sky.
From out + line.
Usage
Often used with the preposition 'of' to describe the subject matter being summarized.