Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: conjectura, from conicere 'to throw together', from com- ( COM-) + jacere 'to throw'

conjecture

1 noun
     
con‧jec‧ture1 formal
1 [uncountable] when you form ideas or opinions without having very much information to base them on:
What she said was pure conjecture.
There has been some conjecture about a possible merger.
2 [countable] an idea or opinion formed by guessing [= guess, hypothesis]:
My results show that this conjecture was, in fact, correct.
—conjectural adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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