I would like to know the history and the original meaning of the word "vector". Thank you for any hints.
The Oxford English Dictionary has this:
J. Harris Lexicon Technicum I, 1704
A Line supposed to be drawn from any Planet moving round a Center, or the Focus of an Ellipsis, to that Center or Focus, is by some Writers of the New Astronomy, called the Vector; because 'tis that Line by which the Planet seems to be carried round its Center.