What is the meaning of Dark?

Having an absolute or (more often) relative lack of light.

Extinguished.

Deprived of sight; blind.

Transmitting, reflecting, or receiving inadequate light to render timely discernment or comprehension: caliginous, darkling, dim, gloomy, lightless, sombre.

Dull or deeper in hue; not bright or light.

Ambiguously or unclearly expressed: enigmatic, esoteric, mysterious, obscure, undefined.

Marked by or conducted with secrecy: hidden, secret; clandestine, surreptitious.

Having racing capability not widely known.

Without moral or spiritual light; sinister, malevolent, malign.

Conducive to hopelessness; depressing or bleak.

Lacking progress in science or the arts.

Extremely sad, depressing, or somber, typically due to, or marked by, a tragic or undesirable event.

With emphasis placed on the unpleasant and macabre aspects of life; said of a work of fiction, a work of nonfiction presented in narrative form, or a portion of either.

Off the air; not transmitting.

A complete or (more often) partial absence of light.

Ignorance.

Nightfall.

A dark shade or dark passage in a painting, engraving, etc.

To grow or become dark, darken.

To remain in the dark, lurk, lie hidden or concealed.

To make dark, darken; to obscure.

dark (used especially to describe a form of punk music)

to achieve, to succeed

to possess, to obtain, to acquire

Source: wiktionary.org