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Latin. A Latin derivative meaning first. From what is before. By the prior reason. In logic. An argument proceeding from causes to effects. From the past; from what has previously transpired. Under the law, this means the process of deducing facts that follow from general principles or accepted truths; because these facts are true than these other facts must follow. 

 - (Logic) Characterizing that kind of reasoning which deduces consequences from definitions formed, or principles assumed, or which infers effects from causes previously known; deductive or deductively. To argue or reason by deduction that because certain facts exist, certain ...