What is Deliberation?

Legal Definition
Deliberation is a process of thoughtfully weighing options, usually prior to voting. Deliberation emphasizes the use of logic and reason as opposed to power-struggle, creativity, or dialog. Group decisions are generally made after deliberation through a vote or consensus of those involved.

In legal settings a jury famously uses deliberation because it is given specific options, like guilty or not guilty, along with information and arguments to evaluate. In "deliberative democracy", the aim is for both elected officials and the general public to use deliberation rather than power-struggle as the basis for their vote.
-- Wikipedia
Legal Definition
Contracts, crimes. The act of the understanding, by which the party examines whether a thing proposed ought to be done or not to be done, or whether it ought to be done in one manner or another. The deliberation relates to the end proposed, to the means of accomplishing that end, or to both.

2. It is a presumption of law that all acts committed, are do-ne with due deliberation, that the party intended to do what he has done. But he may, show the contrary; in contracts, for example, he may show he has been taken by surprise; (q. v.) and when a criminal act is charged, he may prove that it Was an accident, and not with deliberation, that in fact there was no intention or will. See Intention; Will.
-- Bouviers Law Dictionary
Legal Definition
Legislation. The council which is held touching some business, in an assembly having the power to act in relation to it.

2. In deliberative assemblies, it is presumed that each member will listen to the opinions and arguments of the others before he arrives at a conclusion.
-- Bouviers Law Dictionary
Legal Definition
The act or process of deliberating. The act of weighing and examining the reasons for and against a contemplated act or course of conduct or a choice of acts or means. See Deliberate.
-- Black's Law Dictionary
Legal Definition
-- Ballentine's Law Dictionary