Definitions of sight:

• noun:   a optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument
• noun:   the range of vision

  Example: "Out of sight of land"

• noun:   the ability to see; the faculty of vision
• noun:   an instance of visual perception

  Example: "The sight of his wife brought him back to reality"

• noun:   a range of mental vision

  Example: "In his sight she could do no wrong"

• noun:   anything that is seen

  Example: "He was a familiar sight on the television"

• noun:   (often followed by `of') a large number or amount or extent
• noun:   the act of looking or seeing or observing
• verb:   catch sight of; to perceive with the eyes

  Example: "He caught sight of the king's men coming over the ridge"