supplementary /.SApk'mentn; ySApla'mcntn/ adj 1 additional; extra: 增補(bǔ)的; 補(bǔ)充的; 附加的： ~ estimates, eg for additional expenditure; 追加預(yù)算; ~ benefit, (in GB) extra money granted by the State to people in need. (在英囪) (政府對(duì)困危人民的) 額外津貼。 2 (of an angle) making with another a total of 18 (T. (指角度) 補(bǔ)角的。