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This definition comes from Answers.com:
"(mechanics) A vector whose line of application and point of
application are both prescribed, in addition to its direction."
and a discussion on physics forums appears to agree with this
http://www.physicsforums.com/showthread.php?t=391465
The wiki definition seems consistent with this if the tail of the
vector defines a point of application and the head defines the line
of application and the direction.
I am interested to see where this thread leads because many general
physics texts (Knight, for example) carefully define vectors to have
only length and direction
and then later the term "point of
application" is introduced without rationalization with the previous
definition.