Unanimity

n. complete agreement, complete accord

Unanimity is complete agreement by everyone. When unanimous, everybody is of same mind and acting together as an undiversified whole. Many groups consider unanimous decisions a sign of agreement, solidarity, and unity.In the realm of criminal jury trials, many U.S. states and the federal U.S. system require that verdicts be unanimous.
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Noun
1. everyone being of one mind
(hypernym) agreement, accord

(n.)
The quality or state of being unanimous.
  

The term "unanimity" refers to the requirement for all the Member States meeting in the Council to be in agreement before a proposal can be adopted. Since the Single European Act, the unanimity requirement has applied in a much more limited area than before. In the context of the first pillar, voting by qualified majority is now the rule. The second and third pillars, however, still operate largely according to the intergovernmental method and the unanimity requirement.

As some decisions are still taken by unanimity, and as this will become more difficult in an enlarged Europe, the Treaty of Nice has extended the scope of qualified majority voting to other areas and other provisions of Community policy and to a number of policies under the second and third pillars.

See:

•Double majority
•Common commercial policy
•Free movement of persons (visas, asylum, immigration and other policies)
•Justice and home affairs (JHA)
•Pillars of the European Union 
•Qualified majority 
•Single institutional framework 
•Treaty of Nice
•Weighting of votes in the Council