NCIt definition : A unit of luminous intensity, one of the seven base units of the International System
of Units (Systeme International d'Unites, SI). It is the luminous intensity in a given
direction of a small monochromatic light source at 540 terahertz emitting 1/683 watt
per steradian in that direction. This is dependent upon the definitions of the meter,
kilogram, and second.;
Alternative definition : CDISC: The candela is the basic unit of luminous intensity. It is the luminous intensity
in a given direction of a small monochromatic light source at 540 terahertz emitting
1/683 watt per steradian in that direction. This is dependent upon the definitions
of the meter, kilogram, and second.(NCI);