Thanks for creating the Open Definition. I often write and present on Open Source, Open Data, Open Standards, and related technologies , and I intend to be referencing this definition from now on. (It is always easier and better to be able to reference an authoritative source).
I have a couple of comments, which I’ll break into separate threads.
Firstly a housekeeping comment: It would be helpful to be clearer where uses should ask questions and get involved. I suggest on the Participate page  wording be refined from:
- "Discussions have mainly taken place on the od-discuss mailing list and new conversations are encouraged on the Open Knowledge Forum."
- “New conversations are encouraged on the Open Knowledge Forum. (Old discussions have previously taken place on the od-discuss mailing list.)”
And the description about the Open Definition Category  should be updated in a similar manner.
Warm regards, Cameron