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NAmE//ˌsʌpləˈmɛntri//, NAmE//ˌsʌpləˈmɛntəri//
(also supplemental NAmE//ˌsʌpləˈmɛntl//
)Check pronunciation: supplementary
Definition of supplementary adjective from the Oxford Advanced American Dictionary
provided in addition to something else in order to improve or complete it synonym additional supplementary information A supplementary reading list is attached.