1.Definition: concerning one person exclusively

"Each room has a private bath"

Related Adjective(s):individual

2.Definition: concerning things deeply private and personal

"Private family matters"

Related Adjective(s):intimate

3.Definition: confined to particular persons or groups or providing privacy

"A private place", "Private discussions", "Private lessons", "A private club", "A private secretary", "Private property", "The former President is now a private citizen", "Public figures struggle to maintain a private life"

4.Definition: not expressed

"Secret (or private) thoughts"

Related Adjective(s):secret