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supplementation

[suhp-luh-men-tey-shuh n, -muh n-] /ˌsʌp lə mɛnˈteɪ ʃən, -mən-/
noun
1.
the act or process of supplementing.
2.
the state of being supplemented.
3.
something that supplements.
Origin of supplementation
1850-1855
First recorded in 1850-55; supplement + -ation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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