■ adjective
1》 of undisputed origin or veracity; genuine.
2》 Music (of a church mode) containing notes between the principal note or final and the note an octave higher. Compare with plagal .
Derivatives
~ally adverb
~ity ɔ:θɛn'tɪsɪti noun
Origin
ME: via OFr. from late L. ~us , from Gk authentikos 'principal, genuine'.