Dark a. : Destitute, or partially destitute, of light; not receiving, reflecting, or radiating light; wholly or partially black, or of some deep shade of color; not light-colored; as, a dark room; a dark day; dark cloth; dark paint; a dark complexion.

Dark a. : Not clear to the understanding; not easily seen through; obscure; mysterious; hidden.

Dark a. : Destitute of knowledge and culture; in moral or intellectual darkness; unrefined; ignorant.

Dark a. : Evincing black or foul traits of character; vile; wicked; atrocious; as, a dark villain; a dark deed.

Dark a. : Foreboding evil; gloomy; jealous; suspicious.

Dark a. : Deprived of sight; blind.

Dark n. : Absence of light; darkness; obscurity; a place where there is little or no light.

Dark n. : The condition of ignorance; gloom; secrecy.

Dark n. : A dark shade or dark passage in a painting, engraving, or the like; as, the light and darks are well contrasted.

Dark v. t. : To darken to obscure.

Example:
How Dark or light should my foundation and concealer be compared to my skin tone?

Taxonomy
darkness, visible light, absence of light, light and darkness, cold darkness, free encyclopedia, shadows, prince of darkness, 14th century, Square, absorb, contrast, frequency, dark area, the eye, genip, sceadu, colors.

Defination from the web:
dark area has limited light sources, making things hard to see. ... When a vertebrate, like a human, enters a dark area, its iris dilates, allowing more light to enter the eye and improving night vision. ...