WordNet Dictionary- [n] the act of copying or making a duplicate (or duplicates) of something; "this kind of duplication is wasteful"
- [n] the doubling of a word or phrase (as for rhetorical effect)
Webster's 1913 Dictionary\Gem`i*na"tion\, n. [L. geminatio.] A doubling; duplication; repetition. [R.] --Boyle.