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contrast:

The relationship between the lightest and darkest areas in a scene and/or photograph. A small difference means low contrast a great difference high contrast. High contrast scenes usually cause the most exposure problems however, their difficulty can mean they hold the potential for more expression. Though contrast is often linked with scene brightness, there can be low contrast in a bright scene and high contrast in dim light. Contrast can also describe attributes of color, composition, and inherent qualities of film.

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contrast:

The degree of difference between a subject s tones, a function of its inherent shades and colors and also of the quality of light.
glossaryofphotojargonfortravelers

contrast:

The difference between the lightest and darkest part of the photo.
underwatterphotography