/dooh'pli kay"sheuhn, dyooh'-/ , n.
1. an act or instance of duplicating.
2. the state of being duplicated.
3. a duplicate.
4. Genetics. a type of chromosomal aberration in which a region of the chromosome is repeated.
[ 1490-1500; ( duplication- (s. of duplicatio ), equiv. to duplicat ( us ) (see DUPLICATE) + -ion- -ION ]