Unconditional Positive Regard   

The nonjudgmental empathy and respect for another person.  

Unconditioned Response    

The response in a stimulus-response chain that is naturally occurring as opposed to learned.

Unconditioned Stimulus    

The stimulus in a stimulus-response chain that is naturally occurring as opposed to learned.

Unconscious     

According to Freud, the area of the psyche where unknown wishes and needs are kept that play a significant role in our conscious behavior.

Upper Confidence Level

The upper limit of a confidence interval. If prediction states that the true score falls between 80 and 90, then the upper confidence level is 90.