Definitions of decree:

• noun:   a legally binding command or decision entered on the court record (as if issued by a court or judge)
• verb:   issue a decree

  Example: "The King only can decree"

• verb:   decide with authority

  Example: "The King decreed that all first-born males should be killed"

• name:  A surname (very rare: popularity rank in the U.S.: #86196)