Reached a conclusion through logical reasoning from given information or evidence.
From Latin 'deducere' meaning to lead down or derive, from 'de-' (down) plus 'ducere' (to lead). The logical sense developed from the idea of 'leading' thought from general principles to specific conclusions.
Sherlock Holmes made 'deduction' famous, but technically he often used induction (reasoning from specifics to generals). The word's etymology of 'leading down' perfectly captures how deductive reasoning flows from broad principles to narrow conclusions, like water flowing downhill.
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