Definitions of stress:

• noun:   the relative prominence of a syllable or musical note (especially with regard to stress or pitch)

  Example: "He put the stress on the wrong syllable"

• noun:   (physics) force that produces strain on a physical body

  Example: "The intensity of stress is expressed in units of force divided by units of area"

• noun:   difficulty that causes worry or emotional tension

  Example: "She endured the stresses and strains of life"

• noun:   special emphasis attached to something

  Example: "The stress was more on accuracy than on speed"

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

  Example: "Stress is a vasoconstrictor"

• verb:   put stress on; utter with an accent
• verb:   to stress, single out as important
• verb:   test the limits of