For purposes of this subchapter, the term: (1) “Committed youth offender” means an individual committed pursuant to this subchapter. (2) “Conviction” means the judgment on a verdict or a finding of guilty, a plea of guilty, or a plea of no contest. (3) “Court” means the Superior Court of the District of Columbia. (4) “District” means the District of Columbia. (5) “Treatment” means corrective and preventive guidance and training designed to protect the public by correcting the antisocial tendencies of youth offenders. (6) “Youth offender” means a person less than 22 years old convicted of a crime other than murder, first degree murder that constitutes an act of terrorism, and second degree murder that constitutes an act of terrorism.