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Definition of Copy number
1. Noun. (genetics) The number of copies of a gene or plasmid within a cell's genome. ¹
2. Noun. (library science) The identification number assigned to a specific copy of a work. ¹
¹ Source: wiktionary.com
Medical Definition of Copy number
1. The number of molecules of a particular type on or in a cell or part of a cell. Usually applied to specific genes or to plasmids within a bacterium. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)