I think this word means: An issue with two distinct sides of argument.

Actual definition: \DY-uh-dem, noun:

1. A crown.
2. An ornamental headband worn (as by Eastern monarchs) as a badge of royalty.
3. Regal power; sovereignty; empire; — considered as symbolized by the crown.

transitive verb:
1. To adorn with a diadem; to crown.

PP: Blast!