The difference between Dark and Secret
When used as nouns, dark means a complete or (more often) partial absence of light, whereas secret means knowledge that is hidden and intended to be kept hidden.
When used as adjectives, dark means extinguished, whereas secret means being or kept hidden.
Secret is also verb with the meaning: to make or keep secret.
check bellow for the other definitions of Dark and Secret
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Dark as an adjective (of a source of [[light]]):
Having an absolute or (more often) relative lack of light. Extinguished. Deprived of sight; blind.
Examples:
"The room was too dark for reading."
"'Dark signals should be treated as all-way stop signs."
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Dark as an adjective (of colour):
Dull or deeper in hue; not bright or light.
Examples:
"my sister's hair is darker than mine;  her skin grew dark with a suntan"
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Dark as an adjective (betting, of race horses):
Hidden, secret, obscure. Not clear to the understanding; not easily through; obscure; mysterious; hidden. Having racing capability not widely known.
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Dark as an adjective:
Without moral or spiritual light; sinister, malign.
Examples:
"a dark villain;  a dark deed"
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Dark as an adjective:
Conducive to hopelessness; depressing or bleak.
Examples:
"the Great Depression was a dark time;  the film was a dark psychological thriller"
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Dark as an adjective:
Lacking progress in science or the arts; said of a time period.
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Dark as an adjective:
With emphasis placed on the unpleasant aspects of life; said of a work of fiction, a work of nonfiction presented in narrative form or a portion of either.
Examples:
"The ending of this book is rather dark."
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Dark as a noun:
A complete or (more often) partial absence of light.
Examples:
"'Dark surrounds us completely."
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Dark as a noun (uncountable):
Ignorance.
Examples:
"We kept him in the dark."
"The lawyer was left in the dark as to why the jury was dismissed."
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Dark as a noun (uncountable):
Nightfall.
Examples:
"It was after dark before we got to playing baseball."
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Dark as a noun:
A dark shade or dark passage in a painting, engraving, etc.
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Secret as a noun (countable, uncountable):
Knowledge that is hidden and intended to be kept hidden.
Examples:
"Can you keep a secret? So can I."
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Secret as a noun:
The key or principle by which something is made clear; the knack.
Examples:
"The secret to a long-lasting marriage is compromise."
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Secret as a noun:
Something not understood or known.
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Secret as a noun (archaic, in the plural):
The genital organs.
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Secret as an adjective:
Being or kept hidden.
Examples:
"We went down a secret passage."
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Secret as an adjective (obsolete):
Withdrawn from general intercourse or notice; in retirement or secrecy; secluded.
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Secret as an adjective (obsolete):
Faithful to a secret; not inclined to divulge or betray confidence; secretive, separate, apart.
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Secret as an adjective (obsolete):
Separate; distinct.
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Secret as a verb (transitive):
To make or keep secret.
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Secret as a verb (transitive):
To hide secretly.
Examples:
"He was so scared for his safety he secreted arms around the house."