A conscious awareness of rivalry or a desire to compete with someone. Often used in contexts like sports, business, or academics.
He has a strong sense of rivalry toward his rival.
The athlete practiced hard, burning with competitive spirit.
競争心 is a more general competitive mindset, while 対抗意識 specifically implies rivalry against a particular opponent or group.
Compound of 対抗 (opposition, rivalry) and 意識 (consciousness, awareness).