Conjecture vs Speculations - What's the difference?

As a verb conjecture

is .

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

I explained it, but it is pure conjecture whether he understood, or not.

(formal) A supposition based upon incomplete evidence; a hypothesis.

The physicist used his conjecture about subatomic particles to design an experiment.

(mathematics, philology) A statement likely to be true based on available evidence, but which has not been formally (l).

(obsolete) of signs and omens.

* * See also

(conjectur)

(formal) To ; to venture an unproven idea.

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

* South

Human reason can then, at the best, but conjecture what will be.

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(head)