What does WELL mean?

adverb

1. (often used as a combining form) in a good or proper or satisfactory manner or to a high standard (`good' is a nonstandard dialectal variant for `well')“the children behaved well”
2. thoroughly or completely; fully; often used as a combining form“The problem is well understood”
3. indicating high probability; in all likelihood“I might well do it”
4. (used for emphasis or as an intensifier) entirely or fully“a book well worth reading”
5. to a suitable or appropriate extent or degree“the project was well underway”
6. favorably; with approval“their neighbors spoke well of them”
7. to a great extent or degree“I'm afraid the film was well over budget”
8. with great or especially intimate knowledge“we knew them well”