What is the meaning of the word "well"?

Definitions:

(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') adverb
- the children behaved well
an abundant source noun
- They were a well of information.
an open shaft through the floors of a building, such as for a stairway noun
- The well through the building was over fourteen storeys high.
come up, as of a liquid verb
- Tears well in their eyes.
in a manner affording benefit or advantage adverb
- They married well.
in financial comfort adverb
- They live well
in good health especially after having suffered illness or injury adjective
- appears to be entirely well
to a great extent or degree adverb
- I'm afraid the film was well over budget
to a suitable or appropriate extent or degree adverb
- the project was well underway
used for emphasis or as an intensifier meaning entirely or fully adverb
- Berlin is well worth visiting.
with great or especially intimate knowledge adverb
- we knew them well
with prudence or propriety adverb
- You would do well to say nothing more
with skill or in a pleasing manner adverb
- They dance very well.