| known | (adjective) apprehended with certainty | - |
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| nowness | (noun) the quality of being the present | Synonyms: presentness |
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| renown | (noun) the state or quality of being widely honored and acclaimed | Synonyms: celebrity, fame |
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| renowned | (adjective) widely known and esteemed | Synonyms: celebrated, famed, famous, far-famed, illustrious, notable, noted |
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| unbeknown | (adjective) (usually used with `to') occurring or existing without the knowledge of | Synonyms: unbeknownst |
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| (adverb) without someone's knowledge | Synonyms: unbeknownst |
| unbeknownst | (adjective) (usually used with `to') occurring or existing without the knowledge of | Synonyms: unbeknown |
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| (adverb) without someone's knowledge | Synonyms: unbeknown |
| unknown | (adjective) not known | - |
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| (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unidentified, unnamed |
| (adjective) not famous or acclaimed | Synonyms: obscure, unsung |
| (adjective) not known before | Synonyms: strange |
| (adjective) not known to exist | - |
| (noun) a variable whose values are solutions of an equation | Synonyms: unknown quantity |
| (noun) an unknown and unexplored region | Synonyms: terra incognita, unknown region |
| (noun) anyone who does not belong in the environment in which they are found | Synonyms: alien, stranger |
| unowned | (adjective) having no owner | Synonyms: ownerless |
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