Definitions of tension:

• noun:   the action of stretching something tight

  Example: "Tension holds the belt in the pulleys"

• noun:   (physics) a stress that produces an elongation of an elastic physical body

  Example: "The direction of maximum tension moves asymptotically toward the direction of the shear"

• noun:   a balance between and interplay of opposing elements or tendencies (especially in art or literature)

  Example: "There is a tension created between narrative time and movie time"

• noun:   (psychology) a state of mental or emotional strain or suspense

  Example: "He suffered from fatigue and emotional tension"

• noun:   the physical condition of being stretched or strained

  Example: "It places great tension on the leg muscles"

• noun:   feelings of hostility that are not manifest

  Example: "The diplomats' first concern was to reduce international tensions"