dux

noun3

1. •
   (Australia, Scotland) The top (male or female) academic student in a school, or in a year of school; the top student in a specified academic discipline.

   • This school was where my father had been dux in his senior year in 1937 just as his father had been dux at the Rockhampton Grammar School²⁷ before the turn of the 19th century. — 2010
2. •
   (historical) A high-ranking commander in the Roman army, responsible for more than one legion.
3. •
   The subject of a fugue, answered by the comes.