auxiliary

Noun
  1. Someone who acts as assistant (synset 109799690)
Adjective
  1. Functioning in a supporting capacity (synset 301860057)
    "the main library and its auxiliary branches"
  2. Furnishing added support (synset 302363453)
    "an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxiliary to each other"

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