Definition of summary written for English Language Learners from the Merriam-Webster Learner's Dictionary with audio pronunciations, usage examples, and count/noncount noun labels. 2. Summary definition is - comprehensive; especially : covering the main points succinctly. ries 1. Lesson Summary. A summary will inevitably leave out a lot of details, even ones that might seem very important. A Summary of the Short Story "Miss Brill" by Katherine Mansfield "'Miss Brill' is the story of an old woman told brilliantly and realistically, balancing thoughts and emotions that sustain her late solitary life amidst all the bustle of modern life. Synonym Discussion of summary. A summary is shortened retelling of a longer piece, like a book, movie or essay, in your own words. A brief statement mentioning the main points of something: a summary of our findings. How to use summary in a sentence.