duplication

Short definition from Wiktionary

Noun

1. 1
   The act of duplicating.
2. 2
   A duplicate.
3. 3
   A folding over; a fold.
4. 4
   The act or process of dividing by natural growth or spontaneous action.
5. 5
   The act of copying a nucleotide sequence from one chromosome to another.
6. 6
   A nucleotide sequence copied through such a process.