Etymology
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supplemental (adj.)

c. 1600, from supplement (n.) + -al (1). Related: Supplementally. Generally "added to supply what is wanted," whereas supplementary historically tends toward "added as something secondary or supernumerary."

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Definitions of supplemental

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