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vector  The mathematical classification of a quantity which contains more than one piece of information which is organized in a specific manner.  Vectors can always be described as provide information about how far and in which direction (from some point).  For example, the position vector for a tree tells us that the tree in question is not just 5 meters from the house, but that it is five meters to the north of the house.  The information provided by a vector can be denoted in a variety of ways, one of which is as an array (list) of numbers that denote the size of the components of the vector along specific axes.  (See also scalar and magnitude; for an example, compare velocity, and speed.)

velocity (see also speed, vector)

voltage, electrical: (Named for A. Volta)