recorded delivery - definition and synonyms

noun British 

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/rɪˌkɔː(r)dɪd dɪˈlɪv(ə)ri/
singularrecorded delivery
pluralrecorded deliveries
  1. [uncountable] a system for sending a letter safely by which you pay for a record of the fact that you have sent it
    1. a.
      [countable] a letter sent in this way