Definition - What does A Posteriori mean?
A posteriori is a method of reasoning in which larger principles and conclusions are made by looking at information from experiments, observations or evidence.
In the context of the law, "a posteriori" arguments are often made by lawyers in trials to prove their points. In other words, lawyers often try to prove that evidence or observations reveal the larger legal principles of their case.
Justipedia explains A Posteriori
A posteriori is Latin for "from the one behind." A posteriori is synonymous with inductive reasoning. It basically means that conclusions are drawn from the evidence. So, for example, in a liability case involving a car accident, a lawyer may make an a posteriori argument that the tire marks on the road must mean that the car was speeding before it crashed. The lawyer may be able to gather this conclusion with help from a forensics team.