Etymograph

English

deduce

Deduce comes from Middle English deducen ‘to demonstrate, prove, show’, from Latin dēdūcō ‘to lead or bring out or away’, and ultimately from dē ‘of’.

  1. Latinc. 75 BCE–200 CEdē1‘of; from’
  2. Latinc. 75 BCE–200 CEdēdūcō2‘to lead or bring out or away’
  3. Latinc. 75 BCE–200 CEdēdūcere2present active infinitive of dēdūcō
  4. Middle Englishc. 1150–1500deducen2‘to demonstrate, prove, show’
  5. Englishearliest quotation 1593deduce2

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin de-
  2. 2 Wiktionary, English deduce
  3. Earliest quotation in Wiktionary’s entry: 1593, Robert Persons?: “[T]he puritan buyldeth directly vpon the proteſtants firſt groundes…”.

Earlier history not traced here. See Wiktionary.

Lineage

  1. Latinc. 75 BCE–200 CEdēWiktionary, Latin de-‘of; from’
  2. Latinc. 75 BCE–200 CEdēdūcōWiktionary, English deduce‘to lead or bring out or away’
  3. Latinc. 75 BCE–200 CEdēdūcereWiktionary, English deducepresent active infinitive of dēdūcō
  4. Middle Englishc. 1150–1500deducenWiktionary, English deduce‘to demonstrate, prove, show’
  5. Englishearliest quotation 1593deduceWiktionary, English deduce. Earliest quotation in Wiktionary’s entry: 1593, Robert Persons?: “[T]he puritan buyldeth directly vpon the proteſtants firſt groundes…”

The story

From Late Middle English deducen (‘to demonstrate, prove, show; to argue, infer; to bring, lead; to turn (something) to a use; to deduct’), borrowed from Latin dēdūcere, the present active infinitive of dēdūcō (‘to lead or bring out or away; to accompany, conduct, escort; (figuratively) to derive, discover, deduce’); from dē- (prefix meaning ‘from, away from’) + dūcere (the present active infinitive of dūcō (‘to conduct, guide, lead; to draw, pull; to consider, regard, think’), ultimately from Proto-Indo-European *dewk- (‘to lead; to draw, pull’)).

Full etymology on Wiktionary

Linked words

through Latin dē ‘of’

deserve, desire, dice, departmental, dorado, deprive, 4 more

Today it means

verb To reach (a conclusion) by applying rules of logic or other forms of reasoning to given premises or known facts.

Sources

Sources: Wiktionary, “deduce”; the older steps come from the Wiktionary entry for Latin de-. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Latin dē / deduce

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