## subcontrary

sub·con·trar·y *pl.* -·ries

Logic either of two propositions so related that both can be true but both cannot be false

## subcontrary

noun

*pl.*

**sub·con·tra·ries**

*Logic*

A proposition related to another in such a way that both may be true, but both cannot be false.

## subcontrary

Adjective

(*not comparable*)

- 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.

Noun

(*plural* subcontraries)

- (logic) Either of a pair of propositions at least one of which must be true

Origin

*sub-* +"Ž *contrary*