Cannot work with elements in definitions. What am I doing wrong? 
Are you in Dynamo 2.0 or 1.3.x?
2.0
Works now! Thank’s Jonathan!
For further knowledge of what have been changed I can recommend reading below post by @Racel :
http://dynamobim.org/to-dynamo-2-0-and-beyond/
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FYI @robert.ek and @Jonathan.Olesen
Both return x and return = x are supported in 2.0
It looks like the issue with your functions above are because you have Return (notice the uppercase R). Return is not recognized.
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Also, just curious, @robert.ek - did you not get a warning when you tried to run your graph? If so, can you screenshot it?