1. a source of light, especially one used for illumination or lighting
Usage: technical
2. a standard light source used in color measurement and photography
Usage: technical; photography

1. giving off light; illuminating
Usage: formal

Examples

• The photographer adjusted the camera settings for the tungsten illuminant.
• Scientists use standard illuminants to ensure consistent color measurements.
• The illuminant properties of the LED made it ideal for the display.
• Each illuminant produces a different color temperature.
• The illuminant source cast a warm glow across the room.
• Color accuracy depends on the type of illuminant used.
• The illuminant beam highlighted the artwork perfectly.