comp

Concise Oxford English Dictionary © 2008 Oxford University Press:
comp/kɒmp/

▶noun informal

• 1 Brit. a competition.

• 2 Brit. a comprehensive school.

• 3 a composition.

• 4 Brit. a compositor.

• 5 a compilation.

• 6 a musical accompaniment.

• 7 N. Amer. a complimentary ticket or voucher.

▶verb

• 1 play (music) as an accompaniment, especially in jazz or blues.

• 2 (as noun comping) Brit. informal the practice of entering competitions.

• 3 N. Amer. give away as part of a promotion.

– derivatives
comper noun (Brit. informal).