Source : Webster's Revised Unabridged Dictionary (1913)

Aztec \Az"tec\, a.
   Of or relating to one of the early races in Mexico that
   inhabited the great plateau of that country at the time of
   the Spanish conquest in 1519. -- n. One of the Aztec race or
   people.

Source : WordNet®

Aztec
     n : a member of the Nahuatl people who established an empire in
         Mexico that was overthrown by Cortes in 1519