1.be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about;
I know that the President lied to the people
2.know how to do or perform something;
She knows how to knit
3.be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt;
I know that I left the key on the table
4.be familiar or acquainted with a person or an object;
She doesn't know this composer
5.have firsthand knowledge of states, situations, emotions, or sensations;
I know the feeling!
6.accept (someone) to be what is claimed or accept his power and authority;
The Crown Prince was acknowledged as the true heir to the throne
7.have fixed in the mind;
I know Latin
8.have sexual intercourse with;
This student sleeps with everyone in her dorm
9.know the nature or character of;
we all knew her as a big show-off
10. be able to distinguish, recognize as being different;
The child knows right from wrong
11. perceive as familiar;
I know this voice!