Definitions of smell:

• noun:   the act of perceiving the odor of something
• noun:   the faculty of smell
• noun:   the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form

  Example: "She loved the smell of roses"

• noun:   any property detected by the olfactory system
• noun:   the general atmosphere of a place or situation and the effect that it has on people

  Example: "It had the smell of treason"

• verb:   emit an odor

  Example: "The soup smells good"

• verb:   smell bad

  Example: "He rarely washes, and he smells"

• verb:   inhale the odor of; perceive by the olfactory sense