Autosomal DNA is DNA from one of our chromosomes located in the cell nucleus. It generally excludes the sex chromosomes. Humans have 22 pairs of autosomal chromosomes and a pair of sex chromosomes.
Source: “autosome”. Oxford Dictionaries. April 2010. Oxford Dictionaries. April 2010. Oxford University Press. 09 February 2013 (http://oxforddictionaries.com/definition/english/autosome?q=autosome)