A Forum

1. A place for discussion.
2. A gathering for the purpose of discussion.
3. A form of discussion involving a panel of presenters and often participation by members of the audience.
4. (Internet) An Internet message board where users can post messages regarding one or more topics of discussion.
5. (historical) A square or marketplace in a Roman town, used for public business and commerce.

Usage notes

The English plural forums is preferred to the Latin plural fora in normal English usage.

• Ref: Modern English Usage, 2nd Edition, ed. Sir Ernest Gowers, Oxford 1968 (article '-um', p.658).
• Also, "The Oxford Dictionary of American Usage and Style," by Bryan A. Garner. Berkley Books, 2000, (p. 156)