suppositionсуществительное An uncertain belief or assumption that something is true or exists. Her supposition that he would arrive on time was proven wrong when he showed up an hour late.
A hypothesis or theory that is proposed as a basis for reasoning or argument. The scientist's supposition about the effects of the new drug will need to be tested through experiments.
The act or process of supposing; assumption. His entire plan rests on the bare supposition that the market will improve.