[kam-er-uh, kam-ruh]
noun, plural cameras for 1, 2, camerae [kam-uh-ree] , for 3.
a boxlike device for holding a film or plate sensitive to light, having an aperture controlled by a shutter that, when opened, admits light enabling an object to be focused, usually by means of a lens, on the film or plate, thereby producing a photographic image.
(in a television transmitting apparatus) the device in which the picture to be televised is formed before it is changed into electric impulses.
a judge's private office.
Printing. camera-ready.
in camera,
Law. in the privacy of a judge's chambers.
off camera, out of the range of a television or motion-picture camera.
on camera, being filmed or televised by a live camera: Be sure to look alert when you are on camera.

1700–10; < Latin camera vaulted room, vault < Greek kamára vault; see chamber Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
camera (ˈkæmərə, ˈkæmrə)
n , -erae
1.  cine camera See also digital camera an optical device consisting of a lens system set in a light-proof construction inside which a light-sensitive film or plate can be positioned
2.  television the equipment used to convert the optical image of a scene into the corresponding electrical signals
3.  See camera obscura
4.  a judge's private room
5.  in camera
 a.  law relating to a hearing from which members of the public are excluded
 b.  in private
6.  off camera not within an area being filmed
7.  on camera (esp of an actor) being filmed
[C18: from Latin: vault, from Greek kamara]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1708, "vaulted building," from L. camera "vaulted room" (cf. It. camera, Sp. camara, Fr. chambre), from Gk. kamara "vaulted chamber," from PIE base *kam- "to arch." The word also was used early 18c. as a short form of Mod.L. camera obscura "dark chamber" (a black box with a lens that could project images
of external objects), contrasted with camera lucida (Latin for "light chamber"), which uses prisms to produce an image on paper beneath the instrument, which can be traced. It became the word for "picture-taking device" when modern photography began, c.1840 (extended to television filming devices 1928). Camera-shy is from 1922. O.C.S. komora, Lith. kamara, O.Ir. camra all are borrowings from Latin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

camera cam·er·a (kām'ər-ə, kām'rə)
n. pl. cam·er·ae (-ə-rē)
A chamber or cavity, such as one of the chambers of the heart or eye.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But even after the camera crews left, the excitement and enthusiasm generated
  by the debate remained, and that momentum.
After all, the criminal can not be sure the camera is not working.
When making long exposures, use a remote release to avoid camera movement.
For the first time even its legs are visible, thanks to the detail possible
  with the orbiting digital camera.
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