1. noun An open discussion between several people. I think we all need to get together and have a round table to come up with a solution to this problem.

2. adjective Featuring open discussion between several people. Often hyphenated. I think we all need to get together and have a round-table meeting to come up with a solution to this problem.

3. The table where the legendary King Arthur and his knights would gather. Usually capitalized. I'm currently reading a book about King Arthur and the Knights of the Round Table.

4. A shorthand way to refer to King Arthur and his knights as a group. Usually capitalized. Morgan Le Fay is a known enemy of the Round Table.