IPA: /ˈlɑːrdʒli/
KK: /ˈlɑrdʒli/
To a great degree or extent; mostly.
The project was largely successful, meeting most of its goals.
Largely → It is formed from "large" (from Old French *large*, meaning broad or spacious) and "-ly" (a suffix used to form adverbs). The word "largely" means in a broad or spacious manner, or to a great extent.
Think of something that is 'broad' or 'spacious' ('large') and how it can be done 'in that manner' ('-ly'). This helps you remember that 'largely' means to a great extent.