What is the meaning of hidden?

verb

• Prevent from being seen or discovered.
  • usage: "Muslim women hide their faces"; "hide the money"
  • synonyms: hide, conceal
• Be or go into hiding; keep out of sight, as for protection and safety.
  • usage: "Probably his horse would be close to where he was hiding"; "She is hiding out in a cabin in Montana"
  • synonyms: hide, hide out
• Cover as if with a shroud.
  • usage: "The origins of this civilization are shrouded in mystery"
  • synonyms: shroud, enshroud, hide, cover
• Make undecipherable or imperceptible by obscuring or concealing.
  • usage: "a hidden message"; "a veiled threat"
  • synonyms: obscure, blot out, obliterate, veil, hide

adjective

• Not accessible to view.
  • usage: "concealed (or hidden) damage"; "in stormy weather the stars are out of sight"
  • synonyms: concealed, out of sight
• Designed to elude detection.
  • usage: "a hidden room or place of concealment such as a priest hole"; "a secret passage"; "the secret compartment in the desk"
  • synonyms: secret
• Difficult to find.
  • usage: "hidden valleys"; "a hidden cave"; "an obscure retreat"
  • synonyms: obscure