from The Century Dictionary.

  • Same as supplemental.
  • Especially, in anatomy and zoology, additional (to what is normal, ordinary, or usual); added, as something secondary, subsidiary, or useless; supernumerary; extra: as, a supplementary digit (a sixth finger or toe).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Additional; added to supply what is wanted.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective functioning in a supporting capacity
  • adjective added to complete or make up a deficiency


Sorry, no etymologies found.


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  • I think you should add the mathematical meaning: supplementary angles sum up to 180 degrees

    February 12, 2012