Gate:  the pressure plate constructed around the aperture, the rectangular opening which creates a frame for the light passing through it on to the camera.

Magazine:  the compartment into which rolls of film stock are loaded before being attached to the camera.

Matte box: a box which can be attached to the camera, making possible to use a variety of devices - such as mattes and filters and contrast control systems, such as the VariCon. -  which affect the way image is registered.

Motor:  the mechanism which controls the rotation of the shutter and the transport of the film trough the camera, usually at 24 fps(frames per second) to achieve  the persistence of vision (which creates the illusion of movement  when projected at 24 fps).  Variable motors can over crank   to 64 fps and higher, giving the effect of slow motion (projected at 24 fps), or under crank  to as low as 2 fps, giving the effect of high speed .

Shutter: disk with 180 degrees cut out which rotates, so that each frame passing the aperture is exposed to light. The size of the cut out can be varied; a narrow shutter angle results in a strobing effect.

Viewfinder:  in modern camera, the image is reflected from the shutter mirror into the viewfinder, so that the operator can see the exact image being filmed.