a quantity, e.g. velocity or force, that has magnitude and direction and that is commonly represented by a directed line segment whose length represents the magnitude and whose orientation in space represents the direction: compare phasor, scalar2 (2)
an element of a vector space (set consisting of generalized vectors)
an organism, e.g. an insect, that transmits a disease-causing agent
a pollinator (see pollinate)
in genetic engineering, something such as a plasmid (strand of genetic material) that is used to introduce foreign DNA into a cell
a course or compass direction, esp of an aircraft