conjecture

[kuhn-jek-cher]
noun
1.
the formation or expression of an opinion or theory without sufficient evidence for proof.
2.
an opinion or theory so formed or expressed; guess; speculation.
3.
Obsolete. the interpretation of signs or omens.
verb (used with object), conjectured, conjecturing.
4.
to conclude or suppose from grounds or evidence insufficient to ensure reliability.
verb (used without object), conjectured, conjecturing.
5.
to form conjectures.

Origin:
1350–1400; (noun) Middle English < Latin conjectūra (< Middle French) inferring, reasoning, equivalent to conject(us) past participle of conjicere to throw together, form a conclusion (con- con- + -jicere, combining form of jacere to throw) + -ūra -ure; (v.) late Middle English conjecturen (< Middle French) < Late Latin conjecturāre, derivative of the noun

conjecturable, adjective
conjecturably, adverb
conjecturer, noun
misconjecture, verb, misconjectured, misconjecturing; noun
nonconjecturable, adjective
nonconjecturably, adverb
preconjecture, verb (used with object), preconjectured, preconjecturing.
unconjecturable, adjective
unconjectured, adjective


2. surmise, inference, supposition, theory, hypothesis. 4. surmise, suppose, presume. See guess.
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World English Dictionary
conjecture (kənˈdʒɛktʃə)
 
n
1.  the formation of conclusions from incomplete evidence; guess
2.  the inference or conclusion so formed
3.  obsolete interpretation of occult signs
 
vb
4.  to infer or arrive at (an opinion, conclusion, etc) from incomplete evidence
 
[C14: from Latin conjectūra an assembling of facts, from conjicere to throw together, from jacere to throw]
 
con'jecturable
 
adj
 
con'jecturably
 
adv
 
con'jecturer
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

conjecture
late 14c., from L. conjectura "conclusion, interpretation," from conjectus, pp. of conicere "to throw together," from com- "together" + jacere "to throw." Originally of interpretation of signs and omens; sense of "forming of opinion without proof" is 1530s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But he provided too little evidence to guide our conjectures, offering a riddle
  without a solution.
Sometimes she will whisper lines into my ear, lovely conjectures and
  occasionally laughable ditties.
The authors offer some tentative conjectures as to why empirical studies of
  financial innovation are comparatively rare.
To argue logically, one must have sufficient information on the subject to do
  so with facts, not conjectures or guesses.
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