0 the act or process of making an exact copy of something:
Duplication of certain chromosomes can lead to abnormalities.
Organize teams to tackle complex problems and avoid duplication.
1 the practice of doing the same thing more than once, or having more than one person or thing to do the same task, when this is not necessary:
2 the practice of making an exact copy of something, especially when this is illegal:
The defendants never denied the illegal duplication, but claimed they had tried to obtain copyrights.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.