secret

noun
  1. Something that is kept hidden or unknown from others, often intentionally, to prevent disclosure or recognition. noun
    She confided her secret to her best friend.
    The location of the treasure remained a secret for many years.
  2. A piece of information or knowledge that is deliberately kept from others, especially to maintain privacy or confidentiality. noun
    He revealed the company's secret to the press.
    The recipe for the sauce is a closely guarded secret.
  3. Intended or meant to be kept hidden or private; not known or shared publicly. adjective
    They had a secret meeting in the back room.
    Her secret plans were revealed unexpectedly.
  4. To keep something hidden or undisclosed, often intentionally. verb
    He secreted the documents in a safe place.
    She secreted herself behind the curtains to avoid being seen.