an opinion or conclusion formed on the basis of incomplete information.
Merriam-Webster Online Dictionary
conjecture (noun)1.
obsolete
a) interpretation of omens
b) - supposition
2.
a) from defective or presumptive evidence - inference
b) a conclusion by surmise or guesswork - deduced
c) a proposition (as in mathematics) before it has been proved or disproved
transitive verb
1.
to arrive at or deduce by or guesswork - surmise guess scientists conjecturing that a disease is caused by a defective gene
2.
intransitive verb
to make as to - conjectures (see conjecture) conjecture the meaning of a statement to form conjectures - (see conjecture)