Definitions of pain:

• noun:   a somatic sensation of acute discomfort

  Example: "As the intensity increased the sensation changed from tickle to pain"

• noun:   emotional distress; a fundamental feeling that people try to avoid

  Example: "The pain of loneliness"

• noun:   a bothersome annoying person

  Example: "That kid is a terrible pain"

• noun:   a symptom of some physical hurt or disorder

  Example: "The patient developed severe pain and distension"

• noun:   something or someone that causes trouble; a source of unhappiness
• verb:   cause emotional anguish or make miserable

  Example: "It pains me to see my children not being taught well in school"

• verb:   cause bodily suffering to
• name:  A surname (very rare: popularity rank in the U.S.: #46004)