Contamination must be proven with certainty not supposition.
It was only the supposition of Furness, and it is my conviction that they have not.
He seemed to yield to the justice of this supposition in spite of himself.
On any other supposition to the general reader it is unintelligible.
Her strange question seemed to be explained by this supposition.
It will not do, I suppose, to admit such a supposition; yet the marvels which come constantly before me may almost justify it.
"It is pleasant to have your supposition confirmed," Deck ventured to remark.
The supposition that she had died of spontaneous combustion was also entertained by a good many.
On the supposition that the slaves of Besançon were aboard, my heart felt relieved.
It is based upon the supposition that your allegations would be supported by evidence.
early 15c., a term in logic, from Late Latin suppositionem (nominative suppositio) "assumption, hypothesis," noun of action from past participle stem of supponere (see suppose); influenced by Greek hypothesis.