Individual created to gain knowledge for the Orbanians. An approximate comparison would be "apprentice." Once an Urrone's knowledge reaches an impasse, typically by the age of thirteen, the child undergoes the Averium.
Since SG-1's arrival, former Urrone are taught the "old fashioned" way: by teaching.
Learning Curve - SG-1 is perplexed to discover a civilization which utilizes their young as vessels for learning, and then throws them aside.