Etymology
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supplementary (adj.)

1660s, "added as something extra," from supplement (n.) + -ary. Suppletory in the same sense is from 1620s.

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Definitions of supplementary

supplementary (adj.)
functioning in a supporting capacity;
supplementary (adj.)
added to complete or make up a deficiency;
produced supplementary volumes
Synonyms: supplemental
From wordnet.princeton.edu