Noun duplication has 2 senses
  1. duplicate, duplication - a copy that corresponds to an original exactly; "he made a duplicate for the files"
    --1 is a kind of copy
    --1 has particulars:
     backup, computer backup; counterpart, similitude, twin; match, mate
    Derived form: verb duplicate3
  2. duplication, gemination - the act of copying or making a duplicate (or duplicates) of something; "this kind of duplication is wasteful"
    --2 is a kind of copying
    Derived form: verb duplicate3