Deduce
dih-DOOS
/dɪˈduːs/
To arrive at a conclusion or fact by reasoning; to infer from general principles or known facts.
Deduction moves from general statements to specific conclusions. If the premises are true, the conclusion must be true.
The story behind the word. The word 'deduce' comes from the Latin 'deducere,' which means 'to lead down' or 'to draw off.' It's formed from the prefix 'de-' (meaning 'down' or 'away') and the verb 'ducere' (meaning 'to lead'). This imagery of 'leading down' reflects the logical process of tracing an argument from general principles to a specific conclusion.
Word relationships
- conclude: More general, can be based on various types of reasoning.
- infer: Often used interchangeably, but 'infer' can also imply inductive reasoning (specific to general), while 'deduce' is strictly general to specific.
- reason: Broader term for thinking logically.
- speculate: To form a theory without firm evidence.
- guess: To estimate or suppose without sufficient information.
Commonly confused with
- Infer: While often used similarly, 'deduce' specifically refers to drawing a conclusion that must be true if the premises are true (deductive reasoning). 'Infer' can also refer to drawing a conclusion that is likely true (inductive reasoning).
Word family
- deduction (noun): The process of deducing; a conclusion reached by deducing.
- deducible (adjective): Able to be deduced.
Collocations
- deduce from evidence
- deduce a conclusion
- deduce a motive
- deduce a fact
Example sentences
- "Sherlock Holmes was famous for his ability to deduce complex truths from seemingly insignificant details." From the tire tracks, the detective could deduce the type of vehicle. (Arthur Conan Doyle, 'A Study in Scarlet')
- "By analyzing the victim's wounds, the forensic expert could deduce the weapon used." We can deduce from the evidence that the suspect was at the scene.
Memory hook
To 'DEDUCE' is to 'DE-construct' the facts and 'DUCE' (produce) a conclusion. DE-DUCE facts
When not to use
Do not use 'deduce' if you are simply guessing or making an assumption without logical reasoning from evidence. Also, distinguish it from 'infer' if the distinction between deductive and inductive reasoning is important.
Fun facts
- Deductive reasoning is a cornerstone of formal logic and mathematics.
- The famous fictional detective Sherlock Holmes is often cited as a master of deduction, though his methods sometimes leaned more towards induction or abduction.
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