deduce
dih-DOOS
/dɪˈdjuːs/
To arrive at a specific fact or conclusion by reasoning logically from general rules or known premises.
Implies a top-down logical progression where if the general premises are true, the specific conclusion must be guaranteed true.
The story behind the word. In Latin, 'deducere' meant 'to lead down or away'—picture a shepherd guiding sheep down a mountain path. Over time, Roman philosophers adapted the physical leading-down into a mental process: leading your thought down from a broad rule to a specific conclusion.
Word relationships
- derive: 'Derive' implies extracting a principle or formula step-by-step, whereas 'deduce' emphasizes logical certainty.
- infer: 'Infer' reaches a probable conclusion from observation (bottom-up), while 'deduce' applies a general rule to a specific case (top-down).
- induce: 'Induce' moves from specific observations toward general probabilistic rules, whereas 'deduce' moves from general rules to specific conclusions.
Commonly confused with
- infer: You deduce top-down from established general premises; you infer bottom-up by gathering observational clues.
Word family
- deduction (noun): The process of reaching a logical conclusion.
- deductive (adjective): Relating to logical reasoning from general to specific.
Collocations
- deduce a logical conclusion
- deduce from evidence
- deduce facts
- logically deduce
Example sentences
- "From the wet footprints in the hallway and the dripping umbrella by the door, Sarah was able to deduce that her roommate had just returned from the rainstorm." Everyday problem solving
- "We deduce that he is a bachelor, that he is unsociable, and that he is extremely refined." Classic literature detective fiction
Memory hook
Picture a detective leading clue tracks DOWN ('de-') a path to PRODUCE ('duce') the answer. Lead down from general rules to a specific truth.
When not to use
Do not use when making a rough guess based on unstated clues; use 'infer' or 'surmise' instead.
Fun facts
- Sherlock Holmes famously claimed to use deduction, though classicists argue he actually used abductive reasoning!
Related words
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