CON

vt to know; to understand; to acknowledge.

2. con ·vt to conduct, or superintend the steering of (a vessel); to watch the course of (a vessel) and direct the helmsman how to steer.

3. con ·vt to study in order to know; to peruse; to learn; to commit to memory; to regard studiously.

4. con ·adv against the affirmative side; in opposition; on the negative side;

— the antithesis of pro, and usually in connection with it. ·see pro.