**(1)** In computer graphics, a line designated by its end points (X-Y or X-Y-Z coordinates). When a circle is drawn, it is made up of many small vectors. See

vector graphics and

graphics.

**(2)** In matrix algebra, a one-row or one-column matrix.

**(3)** An 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 intrusion to occur.