(1) In computer graphics, a line designated by its end points (X-Y or X-Y-Z coordinates). A circle comprises many small vectors. See
vector graphics and
graphics.
(2) In AI processing, a vector is a set of numbers in a row or column.
(3) Any ordered list of numbers.
(4) An airplane's travel path.
(5) The term is used generically for "pathway" or "avenue" or even an influence of some type. For example, "x, y and z provide multiple threat vectors for malware intrusion" means there are multiple ways for the attack to occur.