knowing

1. To perceive the truth or factuality of; to be certain of or that.

   He knew something terrible was going to happen.

2. To be aware of; to be cognizant of.

   Did you know Michelle and Jack were getting divorced? ― Yes, I knew.

3. To be acquainted or familiar with; to have encountered.

   I know your mother, but I’ve never met your father.

4. To experience.

   Their relationship knew ups and downs.

5. To be able to distinguish, to discern, particularly by contrast or comparison; to recognize the nature of.

   I wouldn't know one from the other.

6. To recognize as the same (as someone or something previously encountered) after an absence or change.
7. To understand or have a grasp of through experience or study.

   His mother tongue is Italian, but he also knows French and English.

8. To have sexual relations with. This meaning normally specified in modern English as e.g. to ’know someone in the biblical sense’ or to ‘know Biblically.’
9. To have knowledge; to have information, be informed.

   He knows about 19th century politics.

10. To be or become aware or cognizant.

    Did you know Michelle and Jack were getting divorced? ― Yes, I knew.

11. To be acquainted (with another person).
12. To be able to play or perform (a song or other piece of music).

    Do you know "Blueberry Hill"?

noun

The act or condition of having knowledge.

1. Possessing knowledge or understanding; intelligent.
2. Shrewd or showing clever awareness.

   a knowing rascal

3. Suggestive of private knowledge.
4. Deliberate