matterien: Amalgam of English ‘matters’ and German ‘materien’ (meaning the same)

matter / noun
something that is being done, talked about, or thought about
the situation or subject that is being discussed or dealt with
the thing that forms physical objects and occupies space

matter / verb 
to be important

“Matter.”  Merriam-Webster, n.d. Web. 7 Apr. 2014.
http://www.merriam-webster.com/dictionary/matter