Good point! Actually someone removed large portions of the telecommunications part of the original contention article. I have now removed your redirect of the Contention (telecommunications) article to CSMA/CD, copied text from the 10 November 2006 version of the contention article into it. However, this text was not very concrete, and did not mention multiple access. I have also added concrete examples of contention based multiple access protocols to the article. The definition of contention based Multiple access should be stated.
Is contention only about multiple access (as stated in the current version of the Contention article), or can it be used in other telecom areas (as implied by the text I copied to the Contention (telecommunications) article)?
We don't have an article on the concept of random multiple access either. Is that always the same thing as contention based multiple access?