duplication

noun

1. (countable, uncountable)The act of duplicating.

   “Another argument for closing Woodhead was simply one of route duplication, and this was the main reason put forward by BR at the time.”

2. (countable, uncountable)A duplicate.

   “Counting crimes as given in the index to the Penal Code, their number is nearly twice as great as that stated, but as some are only duplications I have reduced my estimate that it may be well within the limits of the fact.”

   “Registration of trademarks had been revised and a unit had been set up to clear up duplications.”

   “Duplications were made by carbon paper. If you had a pleading to be sent to three parties, you typed an original and four carbon copies, including an office copy.”

3. (countable, uncountable)A folding over; a fold.
4. (countable, uncountable)The act or process of dividing by natural growth or spontaneous action.

   “duplication of cartilage cells”

5. (countable, uncountable)The act of copying a nucleotide sequence from one chromosome to another.
6. (countable, uncountable)A nucleotide sequence copied through such a process.