supplementary

Adjective
  1. Functioning in a supporting capacity (synset 301860057)
    "the main library and its auxiliary branches"
    similar to: secondary - being of second rank or importance or value; not direct or immediate
    same as: auxiliary, subsidiary, supplemental
  2. Added to complete or make up a deficiency (synset 300050099)
    "produced supplementary volumes"
    similar to: additive - characterized or produced by addition
    same as: supplemental

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