Meaning of congressman-at-large

con•gress•man-at-large

Pronunciation: (kong'gris-mun-ut-lärj'), [key]
— pl. con•gress•men-at-large
  1. a U.S. congressman who is elected from a state as a whole and not from a district.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.