deduce
v.
early 15c., from Latin deducere "lead down, derive" (in Medieval Latin, "infer logically"), from de- "down" (see de-) + ducere "to lead" (see duke, n.). Originally literal; sense of "draw a conclusion from something already known" is first recorded 1520s, from Medieval Latin. Related: Deduced; deducing.
〔李〕[de-=down from从……出来；duc=to lead引导；-e→“to lead a conclusion down from从……引出结论”→] v. draw as conclusion;infer演绎；推理