A Vector

(mathematics) A directed quantity, one with both magnitude and direction; the signed difference between two points.
(mathematics) An ordered tuple representing a directed quantity or the signed difference between two points.
(mathematics) Any member of a (generalized) vector space.
(aviation) A chosen course or direction for motion, as of an aircraft.
(epidemiology) A carrier of a disease-causing agent. Vector (epidemiology) - Wikipedia
(sociology) A person or entity that passes along an urban legend or other meme.
(psychology) A recurring psychosocial issue that stimulates growth and development in the personality.
The way in which the eyes are drawn across the visual text. The trail that a book cover can encourage the eyes to follow from certain objects to others.
(computing, operating systems) A memory address containing the address of a code entry point, usually one which is part of a table and often one that is dereferenced and jumped to during the execution of an interrupt.
(programming) A one-dimensional array.
(computer graphics, attributive) A graphical representation using outlines; vector graphics.Coordinate term: raster
(molecular biology) A DNA molecule used to carry genetic information from one organism into another.

(programming): The term vector is used loosely when the indices are not (either positive or non-negative) integers.

A vector is a quantity that has both magnitude (size) and direction.