Broad Outline
Outline, Overview
noun
The big abbreviation is where you take everything and abbreviate it down to show the big picture. This abbreviation is the broad outline of something bigger.
大略 is a relatively formal word commonly found in writing. It generally refers to a broader, rougher outline or overview rather than a detailed summary.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
大略でいいので、会議の内容を教えてくれませんか？
Just a rough summary is fine, so can you tell me what the meeting was about?
まずは事件の大略を説明してくれないか？
Can you explain the outline of the incident first?
彼の話の大略は理解できたけど、細かい部分はまだよく分かりません。
I understood the gist of his story, but I'm still unclear on the details.
この企画の大略は決まったので、次は詳細を詰めていきましょう。
The broad outline of this project has been decided, so let's work out the details next.