Etymology
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supplement (n.)

late 14c., from Latin supplementum "that which fills up, that with which anything is made full or whole, something added to supply a deficiency," from supplere "to fill up" (see supply (v.)).

supplement (v.)

1829, from supplement (n.). Compare Spanish suplementar. Related: Supplemented; supplementing.

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Definitions of supplement
1
supplement (v.)
add as a supplement to what seems insufficient;
supplement your diet
supplement (v.)
serve as a supplement to;
Vitamins supplemented his meager diet
supplement (v.)
add to the very end;
Synonyms: append / add on / affix
2
supplement (n.)
textual matter that is added onto a publication; usually at the end;
Synonyms: addendum / postscript
supplement (n.)
a quantity added (e.g. to make up for a deficiency);
Synonyms: supplementation
supplement (n.)
a supplementary component that improves capability;
From wordnet.princeton.edu