Webster's English Dictionary

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supplement

1. sup.ple.ment \'s*p-l*-m*nt\ \.s*p-l*-'ment-*l\ n [ME, fr. L 
   supplementum, fr. supple-re to fill up, complete -]more at SUPPLY 1: 
   something that completes or makes an addition  2: a continuation of a book 
   or periodical containing corrections or additio ns 3: the amount by which 
   an arc or an angle falls short of 180 degrees  - sup.ple.men.tal aj
2. sup.ple.ment \'s*p-l*-.ment\ \.s*p-l*-.men-'ta--sh*n, -m*n-\ vt : to add 
   to : COMPLETE  - sup.ple.men.tat.ion n