[dih-doos, -dyoos]

verb (used with object), de·duced, de·duc·ing.

to derive as a conclusion from something known or assumed; infer: From the evidence the detective deduced that the gardener had done it.
to trace the derivation of; trace the course of: to deduce one's lineage.

Origin of deduce

1520–30; < Latin dēdūcere to lead down, derive, equivalent to dē- de- + dūcere to lead, bring
Related formsde·duc·i·ble, adjectivede·duc·i·bil·i·ty, de·duc·i·ble·ness, nounde·duc·i·bly, adverbnon·de·duc·i·ble, adjectivesub·de·duc·i·ble, adjectiveun·de·duced, adjectiveun·de·duc·i·ble, adjective
Can be confusedadduce deduce inducededuce deductdeducible deductible

Synonyms for deduce Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for deduce


verb (tr)

(may take a clause as object) to reach (a conclusion about something) by reasoning; conclude (that); infer
archaic to trace the origin, course, or derivation of
Derived Formsdeducible, adjectivededucibility or deducibleness, noun

Word Origin for deduce

C15: from Latin dēdūcere to lead away, derive, from de- + dūcere to lead
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for deduce

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.

Online Etymology Dictionary, © 2010 Douglas Harper