| a. | 1. | Added to supply what is wanted; additional; being, or serving as, a supplement;
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| Adj. | 1. | supplemental - functioning in a subsidiary or supporting capacity; "the main library and its auxiliary branches" |
| 2. | supplemental - added to complete or make up a deficiency; "produced supplementary volumes"; "additional reading" Synonyms: supplementary, additional |
SUPPLEMENTAL. That which is added to a thing to complete it as a supplemental affidavit, which is an additional affidavit to make out a case; a supplemental bill. (q.v.)
auxiliary, secondary, subsidiary, supplementary