Definition of "Private" :

noun: an enlisted man of the lowest rank in the Army or Marines

"Our prisoner was just a private and knew nothing of value."

adjective: not expressed

"Secret (or private) thoughts."

adjective: concerning one person exclusively

"Each room has a private bath."

adjective: concerning things deeply private and personal

"Private family matters."

adjective: confined to particular persons or groups or providing privacy

"A private place."