What is the meaning of depth?

noun

• The extent downward or backward or inward.
  • usage: "the depth of the water"; "depth of a shelf"; "depth of a closet"
  • synonyms: deepness
• Degree of psychological or intellectual profundity.
• Usually plural. ( the deepest and most remote part)
  • usage: "from the depths of darkest Africa"; "signals received from the depths of space"
• Usually plural. ( a low moral state)
  • usage: "he had sunk to the depths of addiction"
• The intellectual ability to penetrate deeply into ideas.
  • synonyms: astuteness, profundity, profoundness, deepness
• The attribute or quality of being deep, strong, or intense.
  • usage: "the depth of his breathing"; "the depth of his sighs" "the depth of his emotion"