Conjecture Definition

kən-jĕkchər
conjectured, conjectures, conjecturing
noun
conjectures
An inferring, theorizing, or predicting from incomplete or uncertain evidence; guesswork.
An editorial full of conjecture.
Webster's New World
An inference, theory, or prediction based on guesswork; guess.
Webster's New World
Occult divination.
Webster's New World

(formal) A statement or an idea which is unproven, but is thought to be true; a guess.

I explained it, but it is pure conjecture whether he understood, or not.
Wiktionary
Antonyms:
verb
conjectured, conjectures, conjecturing
To arrive at or propose by conjecture; guess.
Webster's New World
To make a conjecture.
Webster's New World
A conclusion or inference based upon incomplete or uncertain evidence. To make a conclusion or inference based upon such evidence.
Webster's New World Law

(formal, intransitive) To guess; to venture an unproven idea.

I do not know if it is true; I am simply conjecturing here.
Wiktionary
Antonyms:

Other Word Forms of Conjecture

Noun

Singular:
conjecture
Plural:
conjectures

Origin of Conjecture

  • From Old French, from Latin coniectūra (“a guess”), from coniectus, perfect passive participle of cōniciō (“throw or cast together; guess”), from con- (“together”) + iaciō (“throw, hurl”); see jet. Compare adjective, eject, inject, project, reject, subject, object, trajectory.

    From Wiktionary

  • Middle English from Old French from Latin coniectūra from coniectus past participle of conicere to infer com- com- iacere to throw yē- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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