convertible - definition and synonyms

adjective 

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/kənˈvɜː(r)təb(ə)l/
  1. something that is convertible can be changed from one form, use, or system into another

    a convertible sofa (=one that can be changed into a bed)

    1. a.
      a convertible currency is the money from one country that can be exchanged for the money of another country