on the supposition that

idiom

: based on the belief without actual proof that (something is so) : based on the assumption that (something is so)

Her decision was made on the supposition that we would all agree.

Examples of on the supposition that in a Sentence

Recent Examples on the Web

Deeply rooted in the Talmud, the primary source of Jewish law and tradition, those interpretations, Dr. Sarna said, were based largely on the supposition that the sight of a woman, and even her voice, is arousing for men. —New York Times, 12 Aug. 2021

McCarthy brought some friends back to the town presumably on the supposition that the magic could be revived. —John Tamny, Forbes, 20 May 2021

The QAnon theory rests on the supposition that a government agent with top-secret Q-level security clearance has been posting cryptic messages on online bulletin boards that hint at happenings going on behind the scenes. —Richard Ruelas, The Arizona Republic, 9 Oct. 2020

Barometer's second-round surveys now ask respondents to name the date of the general election, on the supposition that anyone who can likely plans to cast a ballot. —Arielle Pardes, Wired, 15 Sep. 2020