Having two parts.
Having two participants; joint.
Having vertices that can be divided into two independent sets (see bigraph)
Divided into two at the base.
Of either of two complementary or mutually exclusive things.
Facing in the other direction.
Of leaves and flowers, positioned directly across from each other on a stem.
Located directly across from something else, or from each other.
Extremely different; inconsistent; contrary; repugnant; antagonistic.
In an opposite position.
Facing, or across from.
In a complementary role to.
On another channel at the same time.
Something opposite or contrary to something else.
An opponent.
A person or thing that is entirely different from or the reverse of someone or something else; used to show contrast between two people or two things.
An antonym.
An additive inverse.