Sŭp'-po-sĭ'tion, n.

(po-zĭsh'un), n. [Lat. suppositio; Fr. supposition, Sp. suposicion, It. supposizione.]

1. The act of supposing, laying down, imagining, or admitting as true or existing, what is known not to be true, or what is not proved.
2. That which is supposed; hypothesis.

This is only an infallibility upon supposition that if a thing be true, it is impossible to be false. Tillotson.

3. Doubt; uncertainty.
4. (Mus.) The use of two successive notes of equal length, one of which being a discord supposes the other a concord. [Rare.]