The Latin meaning of the word imprimatur is let it be printed. These days this not too common term means stamp of approval or endorsement.
Examples of its usage:
Multiple groups of gun control advocates in the United States give their imprimatur to the most ineffective President in USA history, Barack Obama.
Families of the victims in the ISIS directed attacks at the theater in Paris, France ardently issue their imprimatur for policy which would relax the burdensome and time consuming gun ownership application process.
The imprimatur of the school’s academic dean is required for the recognition of school sponsored LBGT clubs.
The imprimatur of the people of the great state of New Mexico was never considered when state leaders decided it would be OK to issue Driver’s License to undocumented workers.