policeyoudaoicibaDictYouDict[police 词源字典]
police: [16] Etymologically, the police are in charge of the administration of a ‘city’. In fact, police is essentially the same word as policy ‘plan of action’. Both go back to Latin polītīa ‘civil administration’, a descendant of Greek pólis ‘city’. In medieval Latin a variant polītia emerged, which became French police.

English took it over, and at first continued to use it for ‘civil administration’ (Edmund Burke as late as 1791 described the Turks as ‘a barbarous nation, with a barbarous neglect of police, fatal to the human race’). Its specific application to the administration of public order emerged in France in the early 18th century, and the first body of public-order officers to be named police in England was the Marine Police, a force set up around 1798 to protect merchandise in the Port of London.

=> politics[police etymology, police origin, 英语词源]
police (n.)youdaoicibaDictYouDict
c. 1530, at first essentially the same word as policy (n.1); from Middle French police (late 15c.), from Latin politia "civil administration," from Greek polis "city" (see polis).

Until mid-19c. used in England for "civil administration;" application to "administration of public order" (1716) is from French (late 17c.), and originally in English referred to France or other foreign nations. The first force so-named in England was the Marine Police, set up 1798 to protect merchandise at the Port of London. Police state "state regulated by means of national police" first recorded 1865, with reference to Austria. Police action in the international sense of "military intervention short of war, ostensibly to correct lawlessness" is from 1933. Police officer is attested from 1800. Police station is from 1817.
police (v.)youdaoicibaDictYouDict
"to keep order in," 1580s, from Middle French policer, from police (see police (n.)). Meaning "to keep order by means of police" is from 1837. Related: Policed; policing.