complimentary

英 [kɒmplɪ'ment(ə)rɪ] 美[,kɑmplɪ'mɛntri]

• adj. 赠送的；称赞的；问候的

1. conveying or resembling a compliment;

"a complimentary remark"

2. costing nothing;

"complimentary tickets"