noun
(mathematics, physics) A directed quantity, one with both magnitude and direction; the signed difference between two points.
(programming) A kind of dynamically resizable array.
(epidemiology) A carrier of a disease-causing agent.
(history) Forces, developments, phenomena, processes, systems, etc. which influence the trajectory of history (e.g. imperialism)
verb
To set (particularly an aircraft) on a course toward a selected point.
(computing) To redirect to a vector, or code entry point.