The philosopher defended the principle of non-contradiction during the debate.

Careful readers will detect subtle signs of contradiction in the author's arguments.

The newly canonized nun was hailed as a sign of contradiction, a person whose manifest holiness drew extreme opposition and, in Catholic theology, is thought to point to the presence of the divine.

The politician's speech was riddled with self-contradictions, undermining his credibility.

The philosopher invoked the law of contradiction to argue that a statement cannot be both true and false at the same time.

In many philosophy courses, the law of non-contradiction is introduced as a basic principle of logic.