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English definition of “supplementary”

supplementary

adjective uk   /ˌsʌp.lɪˈmen.tər.i/ us    /-t̬ɚ-/

supplementary adjective (EXTRA)

C2 (US also supplemental) extra: a supplementary incomeToo much and unnecessary

supplementary adjective (ANGLE)

specialized mathematics If an angle is supplementary to another angle, it forms 180° when combined with it.Describing angles, lines and orientations
(Definition of supplementary from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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