complement - definition and synonyms

verb [transitive] 

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present tense
present participlecomplementing
past tensecomplemented
past participlecomplemented
  1. 1
    to combine well with something, often something that has different qualities

    The plants are chosen to complement each other.

  2. 2
    to add another thing to something

    This project is intended to complement, not replace, local authority programmes.