1. Conforming to fact and therefore worthy of belief
   "an authentic account by an eyewitness"
   - reliable 
2. Not counterfeit or copied
   "an authentic signature"
   - bona fide, unquestionable, veritable

See also: authentically, authenticity, echt, genuine, trustable, trustworthy, trusty

Encyclopedia: Authentic

• nitrosobacteria
• Nitrosomonas
• Nitrospan
• Nitrostat
• nitrous
• nitrous acid
• nitrous bacteria
• nitrous bacterium
• nitrous oxide
• nitta tree
• nitty
• nitty-gritty
• nitweed
• nitwit
• nitwitted
• NIV
• niveous
• Nivose
• nix
• nixie
• Nixon
• Nizhni Novgorod
• Nizhnyi Novgorod
• NJ
• Njord