Definition of supplementation in US English:

supplementation

noun

  • The addition of an extra element or amount to something.

    ‘women with unexplained fatigue may benefit from iron supplementation’
    count noun ‘dietary supplementations’
    • ‘Essential fats are necessary for life, but they must be obtained through diet or supplementation because the body cannot make them.’
    • ‘Proper supplementation with fat may also help newborn calves withstand cold temperatures out on the range.’
    • ‘Folate and vitamin D deficiency may necessitate vitamin supplementations.’
    • ‘Enhanced nutritional supplementation has improved symptoms of autism, reducing behavioral problems and increasing communication and sociability.’
    • ‘Our results support the hypothesis that vitamin C supplementation reduces the risk of cancer in the middle and lower parts of the stomach.’

Pronunciation

supplementation

/ˌsəpləˌmenˈtāSH(ə)n//ˌsəpləˌmɛnˈteɪʃ(ə)n/