Noun

(en noun)

Someone who watches over something; a person in charge of something or someone.

The camp monitors look after the children during the night, when the teachers are asleep.

* 1829 , Charles Sprague,

And oft, mild friend, to me thou art

A monitor , though still;

Thou speak'st a lesson to my heart,

Beyond the preacher's skill.

A device that detects and informs on the presence, quantity, etc., of something.

(computing) A device similar to a television set used as to give a graphical display of the output from a computer.

The information flashed up on the monitor .

(computing) A program for viewing and editing.

a machine code monitor

(British) A student leader in a class.

* 1871 , ,

So, as she did not like the masters to be prying about the play-ground out of school, she chose from among the biggest and most trustworthy of her pupils five monitors , who had authority over the rest of the Boys, and kept the unruly ones in order.

* 1881 , , Chapter X,

But it was not so—at least, not always—for though they fell out among themselves, they united their forces against the common enemy—the monitors !

(nautical) One of a class of relatively small armored warships designed for shore bombardment or riverine warfare rather than combat with other ships.

(archaic) An ironclad.

A monitor lizard.

(obsolete) One who admonishes; one who warns of faults, informs of duty, or gives advice and instruction by way of reproof or caution.

* Francis Bacon

You need not be a monitor to the king.

(engineering) A tool holder, as for a lathe, shaped like a low turret, and capable of being revolved on a vertical pivot so as to bring the several tools successively into position.

Noun

(uncountable)   The act of regulating or the condition of being regulated.

(countable)   A law or administrative rule, issued by an organization, used to guide or prescribe the conduct of members of that organization.

*{{quote-magazine, date=2013-05-17

, author=George Monbiot, authorlink=George Monbiot , title=Money just makes the rich suffer , volume=188, issue=23, page=19 , magazine=(The Guardian Weekly) citation , passage=In order to grant the rich these pleasures, the social contract is reconfigured. […]  The public realm is privatised, the regulations restraining the ultra-wealthy and the companies they control are abandoned, and Edwardian levels of inequality are almost fetishised.}}

* Army regulations state a soldier AWOL over 30 days is a deserter.

(European Union law) A form of legislative act which is self-effecting, and requires no further intervention by the Member States to become law.

(lb) Mechanism controlling DNA transcription.

(lb) Physiological process which consists in maintaining homoeostasis.