Constitutionality

Constitutionality is the condition of acting in accordance with an applicable constitution; the status of a law, a procedure, or an act's accordance with the laws or guidelines set forth in the applicable constitution. When one of these (laws, procedures, or acts) directly violates the constitution it is unconstitutional. All the rest are considered constitutional until challenged and declared otherwise.

Read more about Constitutionality:  Applicability, Examples of Unconstitutional Actions, Unconstitutional Laws in The United States