deduce

UK: /dɪˈdjuːs/ US: /dɪˈdus, -ˈdjus/ ,(di do̅o̅s′, -dyo̅o̅s′)

Inflections of 'deduce' (v): (⇒ conjugate)

deduces

v 3rd person singular

deducing

v pres p

deduced

v past

deduced

v past p

WordReference Random House Learner's Dictionary of American English © 2025

de•duce /dɪˈdus, -ˈdyus/   v., -duced, -duc•ing. 

1. to figure out (something) as a conclusion from something else;
   infer: [ ~ + obj]:
   to deduce the path of the hurricane.
   [ ~ + (that) clause]:
   From her conversation I deduced that she had a large family.

de•duc•i•ble, adj. See -duc-.

WordReference Random House Unabridged Dictionary of American English © 2025

de•duce  (di do̅o̅s′, -dyo̅o̅s′), v.t., -duced, -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.
2. to trace the derivation of;
   trace the course of:
   to deduce one's lineage.

• Latin dēdūcere to lead down, derive, equivalent. to dē- de- + dūcere to lead, bring
• 1520–30

de•duc′i•ble, adj. 
de•duc′i•bil′i•ty, de•duc′i•ble•ness, n. 
de•duc′i•bly, adv. 
Synonyms

• 1. conclude, reason, gather, determine.

Collins Concise English Dictionary © HarperCollins Publishers::

deduce / dɪˈdjuːs/ verb (transitive)

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

Etymology: 15th Century: from Latin dēdūcere to lead away, derive, from de- + dūcere to lead

deˈducible adjective