According to the U.S. Department of Housing and Urban Development (see link), it seems that previous home owners who haven't owned a home for over 3 years can be defined at as a "first time home buyer". What the HUD says exactly is:
"An individual who has had no ownership in a principal residence during the 3-year period ending on the date of purchase of the property. This includes a spouse (if either meets the above test, they are considered first-time homebuyers)."
Am I right in my interpretation? For example, if I used to own a house as a primary residence over 3 years ago, but have since been renting, do I qualify as a "first time home buyer"?