(general) The act or process of duplicating; the state of being duplicated; a doubling.
(biology) The state or act of dividing as a natural process of growth or a spontaneous action.
(genetics) The act or process of duplicating or repeating a region in the genetic material or chromosome, as in gene duplication and chromosomal duplication.
(pathology) A disorder in which a body part is duplicated, such as in diprosopus (a craniofacial duplication) and diphalia (a penile duplication).
Word origin: Latin duplicātiōn– (s. of duplicātiō), equiv. to duplicāt(us) + –iōn.
Related form: duplicate.
Related term: gene duplication.