Meaning of “outline” - Learner’s Dictionary

outline

noun [ C ] uk us /ˈaʊtlaɪn/
DESCRIPTION

B2 a short description of the most important ideas or facts about something:

He gave us a brief outline of the town's history.
SHAPE

the shape made by the outside edge of something

(Definition of “outline noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)