A

Additive Primaries : Red, green, and blue (RGB). Lights of these colors, when mixed together in varying intensities, produce a wide range of color (the spectrum)

Ambient Light : A global (artificial) illumination level representing infinite diffuse reflections from all surfaces within a scene ensuring that all surfaces are visible (lit) particularly those without direct illumination.

Anti-aliasing : Antialiasing is a method of reducing or preventing aliasing artifacts when rendering by using color information to simulate higher screen resolutions. In one technique, blurred pixels are introduced by filtering the image, or individual elements. The blending of pixel colors on the perimeter of hard-edged shapes, like type, to smooth out undesirable edges (jaggies).

Aspect Ratio : The ratio of the width of an image to its height (x:y). For example, the aspect ratio of an image 640 x 480 pixels is 4:3.

Axis : The Hypothetical linear path. The X, Y, and Z axes (width, height, and depth, respectively) define directions of the 3D universe. The axis along which an object is rotated is the axis of rotation.