Logic either of two propositions so related that both can be true but both cannot be false
nounpl. sub·con·tra·ries Logic
A proposition related to another in such a way that both may be true, but both cannot be false.
- Contrary in an inferior degree.
- (geometry) Having, or being in, a contrary order; said of a section of an oblique cone having a circular base made by a plane not parallel to the base, but so inclined to the axis that the section is a circle; applied also to two similar triangles when so placed as to have a common angle at the vertex, the opposite sides not being parallel.
- (logic) Denoting the relation of opposition between the particular affirmative and particular negative. Of these both may be true and only one can be false.
sub- +"Ž contrary