A marriage bond, license, return, and register are four different processes. In Colonial times, a couple wishing to be married went to the county clerk with proof of eligibility of marriage -- being of legal age and single status. This proof was "bonded," usually with a sum of money, and the bondsman was often a relative, not necessarily a parent, of the bride. The clerk issued a license, which was taken by the couple to their minister. After the marriage was performed, the minister sent a "return" to the clerk, signifying that the marriage had taken place, and the marriage was recorded or registered. However, the bonds and the licenses were also recorded at the time of issue or acceptance; thus the presence of a bond and/or license doesn't mean the couple actually was married. Making matters more difficult is the fact that sometimes the ministers neglected to send a return, or it was subsequently lost, so that the marriage was never recorded.
[from Marriage Bonds and Licenses at http://www.tngenweb.org/law/bond.htm]

Spotsylvania Marriage Bond and Registers: This is an index of the Marriage Bonds and Registers from 19th-century Spotsylvania County from

• Spotsylvania County, Virginia, marriage bonds, 1793-1833;
• Spotsylvania County, Virginia, marriage register, 1793-1853;
• Spotsylvania County, Virginia, federal census, 1810;
• Fredericksburg, Virginia, federal census, 1810,
  All compiled by Lynn D. Harvison, 1989, VR975.5365 Sp.