something which completes or enhances something else when added to it
增补物,补充物
- 
                                                
the handout is a supplement to the official manual .这本分发的印刷品是官方手册的补充。
 
a substance taken to remedy the deficiencies in a person's diet
补给品,补品
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multivitamin supplements .多种维生素补品。
 
a separate section, especially a colour magazine, added to a newspaper or periodical
(尤指报纸,期刊的彩色)增刊。
an additional charge payable for an extra service or facility
额外服务费用
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the single room supplement is£2 per night .每间单人房每晚收2英镑的额外服务费用。
 
【几 何】 补角。
add an extra element or amount to
增补,补充
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she took the job to supplement her husband's income .她接受这份工作以补贴丈夫的收入。
 
"late Middle English:  from Latin 
