View synonyms for deduce


[ dih-doos, -dyoos ]

verb (used with object)

, de·duced, de·duc·ing.
  1. to derive as a conclusion from something known or assumed; infer:

    From the evidence the detective deduced that the gardener had done it.

    Synonyms: determine, gather, reason, conclude

  2. to trace the derivation of; trace the course of:

    to deduce one's lineage.


/ dɪˈdjuːs /


  1. may take a clause as object to reach (a conclusion about something) by reasoning; conclude (that); infer
  2. archaic.
    to trace the origin, course, or derivation of
“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

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Derived Forms

  • deˌduciˈbility, noun
  • deˈducible, adjective
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Other Words From

  • de·duci·ble adjective
  • de·duci·bili·ty de·duci·ble·ness noun
  • de·duci·bly adverb
  • nonde·duci·ble adjective
  • subde·duci·ble adjective
  • unde·duced adjective
  • unde·duci·ble adjective
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Word History and Origins

Origin of deduce1

First recorded in 1520–30; from Latin dēdūcere “to lead down, derive,” from dē- de- + dūcere “to lead”
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Word History and Origins

Origin of deduce1

C15: from Latin dēdūcere to lead away, derive, from de- + dūcere to lead
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Example Sentences

Estimating the number of missed outbursts, the astronomers deduced the yearly nova rate.

Lili Torok, a Crisis Text Line senior data researcher, said that her firm’s machine-learning software tries to deduce when a person is at “imminent risk,” meaning they have expressed “suicidal threats.”

From Fortune

It puts out so much light that the upcoming James Webb Space Telescope should be able to deduce the atmospheres of the planets, giving researchers additional clues to how they might have formed.

She said that she deduced that my brother's grown son, who lives with his parents, was not invited to the wedding.

He deduced the difference, from the perspective of a quarterback, between a detail like a firm plant at the top of a route or a one-two stutter step.

A shriek of glee briefly broke out across the Web as inquiring minds tried to deduce who was the lucky lady.

From this it was possible to deduce that the airplane hit the ocean whole, and at what speed.

In fact, we are left to deduce the content of her letters to him from his responses to her.

They want the jury to deduce that it was a sort of habitual foreplay employed by the popular coach.

The greatest gift is our own eyes, sense of smell, and abilities to deduce.

Of the social animals, man presents the most complete type, and the one from which we can best deduce the conditions of the class.

That we are able from the hypothesis to deduce the known facts, gives only the affirmative instance, A B C, a b c.

In any other case, it is no evidence of the truth of the hypothesis that we are able to deduce the real phenomena from it.

We arrive at it by comparing different passages together; we deduce it from the thread and connection of the discourse.

We must have the courage to look at the facts unflinchingly, and deduce from them all the wondrous consequences they involve.


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