[on-kam-er-uh, -kam-ruh, awn-] 
| within the range of a motion-picture or television camera; while being filmed or televised: on-camera blunders; The assassination happened on-camera. |
[kam-er-uh, kam-ruh] noun, plural -er⋅as for 1,2, -er⋅ae [-uh-ree] for 3, adjective | 1. | 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. |
| 2. | (in a television transmitting apparatus) the device in which the picture to be televised is formed before it is changed into electric impulses. |
| 3. | a judge's private office. |
| 4. | Printing. camera-ready. |
| 5. | in camera,
|
| 6. | off camera, out of the range of a television or motion-picture camera. |
| 7. | on camera, being filmed or televised by a live camera: Be sure to look alert when you are on camera. |
cam·er·a (kām'ər-ə, kām'rə)  (click for larger image in new window) n.
[Late Latin, room; see chamber.] |
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.
on camera
Being filmed, as in When the talk-show host began, I wasn't sure if we were on camera. This usage dates from the first half of the 1900s, soon after the birth of motion-picture and television filming. The same is true of the antonym off camera, meaning "outside the view of a movie or TV camera," as in Go ahead and scratch
we're off camera now.