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A posteriori, Latin for "from the latter", is a term from logic, which usually refers to reasoning that works backward from an effect to its causes. This kind of reasoning can sometimes lead to false conclusions. The fact that sunrise follows the crowing of a rooster, for example, doesn't necessarily mean that the rooster's crowing caused the sun to rise.
Origin and Etymology of a posteriori
Latin, literally, from the latter
First Known Use: 1588
A POSTERIORI Defined for English Language Learners
Definition of a posteriori for English Language Learners
: relating to what can be known by observation rather than through an understanding of how certain things work
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