with the supposition that

So let’s look ahead, to fall 2021, with the supposition that things have returned to something like normal.

From Los Angeles Times ● Aug. 28, 2020

That they conspired to impose falsehood upon the world is, moreover, utterly inconsistent with the supposition that they were honest men; a fact, to the proofs of which we have already adverted.

From An Examination of the Testimony of the Four Evangelists by Simon Greenleaf

The poem concludes with the supposition that in the life to come this faculty will be greatly enlarged.

From Character Sketches of Romance, Fiction and the Drama A Revised American Edition of the Reader's Handbook, Vol. 3 by Ebenezer Cobham Brewer

There was a noticeable shrinkage in our profits from trail operations, but with the supposition that it was merely an off year, the matter was passed for the present.

From Reed Anthony, Cowman by Andy Adams

Let us proceed with the supposition that we have before us, at the conclusion of this war, a period of great national suffering.

From The Continental Monthly, Vol. 5, No. 3, March, 1864 Devoted to Literature and National Policy by Various