1. noun /kənˈdʒɛk.tʃə,kənˈdʒɛk.tʃɚ/
a) 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.
The physicist used his conjecture about subatomic particles to design an experiment.
See Also: conject, conjectural
2. verb /kənˈdʒɛk.tʃə,kənˈdʒɛk.tʃɚ/
To guess; to venture an unproven idea.
I do not know if it is true; I am simply conjecturing here.
Wikipedia foundation.