vector definition physics
By Andrew Zimmerman Jones. Definition: A vector is a mathematical quantity that has both a magnitude and direction. It is often represented in variable form in boldface with an arrow above it.Many quantities in physics are vector quantities. A unit vector is a vector with a magnitude of 1 and is often denoted in boldface with a carat (^) above the variable.efinition: A vector is a mathematical quantity that has both a magnitude and direction. It is often represented in variable form in boldface with an arrow above it.