Adjective

(-)

That exists, or has existence, especially that exists now.

*{{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= The attack of the MOOCs , passage=Since the launch early last year of […] two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. University brands built in some cases over centuries have been forced to contemplate the possibility that information technology will rapidly make their existing business model obsolete.}}

Adjective

(en adjective)

Of the same origin as claimed; genuine.

The experts confirmed it was an authentic signature.

Conforming to reality and therefore worthy of trust, reliance, or belief.

The report was completely authentic .

an authentic''' writer; an '''authentic''' portrait; '''authentic information

(music, of a Gregorian mode) Having the final as the lowest note of the mode.

(obsolete) authoritative

(Milton)