noun con·jec·ture \kən-ˈjek-chər\

: an opinion or idea formed without proof or sufficient evidence

Full Definition of CONJECTURE

a :  interpretation of omens
b :  supposition
a :  inference from defective or presumptive evidence
b :  a conclusion deduced by surmise or guesswork
c :  a proposition (as in mathematics) before it has been proved or disproved

Examples of CONJECTURE

  1. The biography includes conjectures about the writer's earliest ambitions.
  2. a conjecture about the extent of the injury
  3. Most of the book is conjecture, not fact.
  4. Whether Columbus brought syphilis to the New World—or to the Old World—has been the subject of conjecture for at least 500 years. —Carl Zimmer, Science, 11 May 2001


Middle English, from Middle French or Latin; Middle French, from Latin conjectura, from conjectus, past participle of conicere, literally, to throw together, from com- + jacere to throw — more at jet
First Known Use: 14th century

Other Logic Terms

a posteriori, connotation, corollary, inference, mutually exclusive, paradox, postulate, syllogism

Rhymes with CONJECTURE


verb con·jec·ture \kən-ˈjek-chər\

: to form an opinion or idea without proof or sufficient evidence

con·jec·turedcon·jec·tur·ing \-ˈjek-chə-riŋ, -ˈjek-shriŋ\

Full Definition of CONJECTURE

transitive verb
:  to arrive at or deduce by surmise or guesswork :  guess <scientists conjecturing that a disease is caused by a defective gene>
:  to make conjectures (see 1conjecture)as to <conjecture the meaning of a statement>
intransitive verb
:  to form conjectures(see 1conjecture)
con·jec·tur·er \-ˈjek-chər-ər\ noun

Examples of CONJECTURE

  1. Some have conjectured that the distant planet could sustain life.
  2. We only conjecture about his motives.
  3. It is fashionable now to conjecture that the Big Bang was caused by a random quantum fluctuation in a vacuum devoid of space and time. —Martin Gardner, Skeptical Inquirer, November/December 1998


(see 1conjecture)
First Known Use: 15th century


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