| authentic | (adjective) not counterfeit or copied | Synonyms: bona fide, unquestionable, veritable |
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| (adjective) conforming to fact and therefore worthy of belief | Synonyms: reliable |
| authenticated | (adjective) established as genuine | Synonyms: attested, documented |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| authoritative | (adjective) endowed with authority | Synonyms: authorised, authorized |
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| (adjective) having authority or ascendancy or influence | Synonyms: important |
| (adjective) of recognized authority or excellence | Synonyms: definitive |
| authorized | (adjective) endowed with authority | Synonyms: authorised, authoritative |
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