- The definition of a benefactor is a person who lends support, especially financial support, to a cause.
An example of a benefactor is a person who gives a new artist money to have a gallery show.
benefactor definition by Webster's New World
Origin: Middle English ; from LL: see benefaction
benefactor definition by American Heritage Dictionary
Origin: Middle English, from Late Latin, from Latin benefacere, to do a service; see benefaction.