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n. pl. police
1. (used with a pl. verb)
a. A body of government employees trained in methods of law enforcement and crime prevention and detection and authorized to maintain the peace, safety, and order of the community.
b. A body of persons with a similar organization and function: campus police. Also called police force.
2. Archaic Regulation and control of the affairs of a community, especially with respect to maintenance of order, law, health, morals, safety, and other matters affecting the public welfare.
3. Informal A group that admonishes, cautions, or reminds: grammar police; fashion police.
a. The cleaning of a military base or other military area: Police of the barracks must be completed before inspection.
b. The soldiers assigned to a specified maintenance duty.
tr.v. po·liced, po·lic·ing, po·lic·es
1. To regulate, control, or keep in order with a law enforcement agency or other official group.
a. To impose one's viewpoint or beliefs regarding, especially in an authoritarian way: policing others' comments by implementing speech codes.
b. To critique in a presumptuous or arrogant manner: policed the grammar of everyone who commented on the blog post.
3. To make (a military area, for example) neat in appearance: policed the barracks.

[French, from Old French policie, civil organization, from Late Latin polītīa, from Latin, the State, from Greek polīteia, from polītēs, citizen, from polis, city; see pelə- in Indo-European roots.]

po·lice′a·ble adj.
po·lic′er n.
References in classic literature ?
In another he would find organising forces stoutly at work, newly-painted notice boards warning off vagrants, the roads and still cultivated fields policed by armed men, the pestilence under control, even nursing going on, a store of food husbanded, the cattle and sheep well guarded, and a group of two or three justices, the village doctor or a farmer, dominating the whole place; a reversion, in fact, to the autonomous community of the fifteenth century.
If Letton could only put him off long enough for them to escape into the policed world outside the office door, all would be well; and Daylight showed all the signs of being put off.
3) Individual and corporate citizens policed by public law enforcement also increasingly are becoming the clients of private security, as illustrated by increases in the use of corporate security and the number of gated communities.