authentic

adj.

1. Conforming to fact and therefore worthy of trust, reliance, or belief: an authentic account by an eyewitness.
2. Having a claimed and verifiable origin or authorship; not counterfeit or copied: an authentic medieval sword.
3. Law. Executed with due process: an authentic deed.
4. Music.
   1. Of, relating to, or being a medieval mode having a range from its final tone to the octave above it.
   2. Of, relating to, or being a cadence with the dominant chord immediately preceding the tonic chord.
5. Obsolete. Authoritative.

[Middle English autentik, from Old French autentique, from Late Latin authenticus, from Greek authentikos, from authentēs, author.]

authentically au·then'ti·cal·ly adv.

SYNONYMS  authentic, bona fide, genuine, real, true, undoubted, unquestionable. These adjectives mean not counterfeit or copied: an authentic painting by Corot; a bona fide transfer of property; genuine crabmeat; a real diamond; true courage; undoubted evidence; an unquestionable antique.
ANTONYM  counterfeit

adjective

1. Worthy of belief, as because of precision or faithfulness to an original: authoritative, convincing, credible, faithful, true, trustworthy, valid. See true/false.
2. Not counterfeit or copied: actual, bona fide, genuine, good, indubitable, original, real, true, undoubted, unquestionable. See true/false.

adj

Definition: real, genuine
Antonyms: counterfeit, fake, false, falsified, unauthorized, ungenuine, unreal

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IN BRIEF: Genuine, true; something that can be believed.

John Hancock's signature was authentic on the document.

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Dansk (Danish)
adj. - autentisk, uforfalsket, ægte

Nederlands (Dutch)
authentiek, onvervalst, net echt, betrouwbaar

Français (French)
adj. - authentique, (Jur) faire foi

Deutsch (German)
adj. - authentisch, original, berechtigt

Ελληνική (Greek)
adj. - αυθεντικός, γνήσιος

Italiano (Italian)
autentico, valido

Português (Portuguese)
adj. - autêntico, legítimo, genuíno, exato, certo, autorizado, competente

Русский (Russian)
подлинный, настоящий, действительный, имеющий законную силу

Español (Spanish)
adj. - auténtico, legítimo, legal, válido

Svenska (Swedish)
adj. - autentisk

中文（简体）(Chinese (Simplified))
可信的, 可靠的, 真实的

中文（繁體）(Chinese (Traditional))
adj. - 可信的, 可靠的, 真實的

한국어 (Korean)
adj. - 믿을 만한, 진정한, 정격의

日本語 (Japanese)
adj. - 信頼すべき, 本物の

العربيه (Arabic)
‏(صفه) أصلي, حقيقي, موثوق‏

עברית (Hebrew)
adj. - ‮אמיתי, אמין, אותנטי‬

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