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88 entries found.
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hidden (adj.)
past-participle adjective from hide (v.1); a Middle English formation (Old English had gehydd "hidden") on the model of ride/ridden, etc. As "secret, occult" from 1540s. Hidden persuaders (1957) was Vance Packard's term for ad men.
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cryptonym (n.)

"private, secret, or hidden name," 1868 (by 1855 in German); from crypto- "secret, hidden" + -onym "name," from Greek (from PIE root *no-men-"name").

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cryptic (adj.)

1630s, "hidden, occult, mystical," from Late Latin crypticus, from Greek kryptikos "fit for concealing," from kryptos "hidden" (see crypt). Meaning "mysterious, enigmatic" is attested by 1920. Related: Cryptically.

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latescent (adj.)
"tending to become latent or obscure, not obvious to perception," 1836, from Latin latescentem (nominative latescens), present participle of latescere "to hide oneself, be hidden," inchoative of latere "to lie hidden" (see latent). Related: Latescence.
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covert (adj.)

"hidden, private, secret, concealed," c. 1300, from Old French covert (Modern French couvert) "hidden, obscure, underhanded," literally "covered," past participle of covrir "to cover" (see cover (v.)). Related: Covertly.

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latent (adj.)

mid-15c., "concealed, secret," from Latin latentem (nominative latens) "lying hid, concealed, secret, unknown," present participle of latere "lie hidden, lurk, be concealed," from PIE *late-, suffixed form of root *lādh- "to be hidden" (source also of Greek lēthē "forgetfulness, oblivion," lēthargos "forgetful," lathre "secretly, by stealth," lathrios "stealthy," lanthanein "to be hidden;" Old Church Slavonic lajati "to lie in wait for"). Meaning "dormant, undeveloped" is from 1680s, originally in medicine.

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clandestine (adj.)

"secret, private, hidden, furtive," 1560s, from Latin clandestinus "secret, hidden," from clam "secretly," from adverbial derivative of base of celare "to hide" (from PIE root *kel- (1) "to cover, conceal, save"), perhaps on model of intestinus "internal." Related: Clandestinely. As a noun form, there is awkward clandestinity (clandestineness apparently being a dictionary word).

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Muscat 
capital of Oman, from Arabic Masqat, said to mean "hidden" (it is isolated from the interior by hills).
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arcana (n.)
"hidden things, mysteries," 1590s, a direct adoption of the Latin plural of arcanum "a secret, a mystery," an important word in alchemy, from neuter of adjective arcanus "secret, hidden, private, concealed" (see arcane). Occasionally mistaken for a singular and pluralized as arcanas, because arcana is far more common than arcanum.
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