The two principal characteristics of term insurance are: the insured must die for any benefits to be paid and, by definition, the contract expires at the end of the term. (thinkadvisor.com)
The relationship between principal characteristics, principal turnover, teacher quality, teacher turnover and student achievement. (ajeforum.com)
Attention Deficit / Hyperactivity Disorder is a condition whose principal characteristics are inattention, hyperactivity and impulsivity. (blog.bartonpublishing.com)