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late 14c., "pertaining or belonging to oneself, not shared, individual; not open to the public;" of a religious rule, "not shared by Christians generally, distinctive; from Latin privatus "set apart, belonging to oneself (not to the state), peculiar, personal," used in contrast to publicus, communis; past participle of privare "to separate, deprive," from privus "one's own, individual," from PIE *prei-wo-, from PIE *prai-, *prei-, from root *per- (1) "forward, through" (see per).
Old English in this sense had syndrig. Private grew popular 17c. as an alternative to common (adj.), which had overtones of condescention. Of persons, "not holding public office," recorded from early 15c. In private "privily" is from 1580s. Related: Privately. Private school is from 1650s. Private parts "the pudenda" is from 1785. Private enterprise first recorded 1797; private property by 1680s; private sector is from 1948. Private eye "private detective" is recorded from 1938, American English.
1590s, "private citizen," short for private person "individual not involved in government" (early 15c.), or from Latin privatus "man in private life," noun use of the adjective; 1781 in the military sense, short for Private soldier "one below the rank of a non-commissioned officer" (1570s), from private (adj.).
in most armies, the lowest grade of enlisted personnel. In the armies of the United States, Germany, and France, a private ranks below a private first class, who in turn ranks below a corporal. In the army of the People's Republic of China, private second class ranks below private first class. The grade equivalent to private in other branches of the armed services in the United States varies; in the U.S. Navy it is seaman, in the U.S. Air Force, airman.