No, Contentious is not derived from content. It’s not its adjective. It’s not another noun with the same meaning. It’s a totally different word that has a totally different meaning.
Content [kuhn-tent] or Contented [kuhn-ten-tid] (adj.):
satisfied, contempt, agreeing.
Example:
You can’t bribe me with your money, I’m contented with my own.
Contentious [kuhn-ten-shuhs] (adj.):
1. argumentative, quarrelsome.
2. causing argument or strife.
Example:
When the issue became contentious, the negotiation had to be halted until both parties regained their composure.
Words of Margaux 
Did you mean ‘content’ not contempt?
I do love your word choices…
Both content and contempt have the same meaning, contended. Thank you for your comment 🙂
You make me ashamed as English is my first language. At least it made me look up the words you suggested!!
My apologies, I had no intention of shaming anyone. I only aim to refresh my readers’ memory, as well as my own. Have a nice day 🙂
That was very insightful!
I just nominated you for a Lighthouse Award. You can check the details here: http://writingsmarter.wordpress.com/2014/02/24/the-lighthouse-award/
Julius
I would agree with b00kreader…. that picture is absolutely stunning!! Helpful blog content btw!
beautiful as always!
It would seem logical that pretentious would be a derivative of contentious, or vice versa.
Awesome picture choice 🙂 !