NOUN (3)

1. an official in a modern colony who has considerable administrative power;

2. a provincial governor of consular rank in the Roman Republic and Roman Empire;

3. an anthropoid ape of the genus Proconsul;

The Collaborative International Dictionary of English v.0.48:

Proconsul \Pro*con"sul\, n. [L., fr. pro for + consul consul.]
   (Rom. Antiq.)
   An officer who discharged the duties of a consul without
   being himself consul; a governor of, or a military commander
   in, a province. He was usually one who had previously been
   consul.
   [1913 Webster] Proconsular

WordNet (r) 3.0 (2006):

proconsul
    n 1: an official in a modern colony who has considerable
         administrative power
    2: a provincial governor of consular rank in the Roman Republic
       and Roman Empire
    3: an anthropoid ape of the genus Proconsul

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "proconsul":
   beg, beglerbeg, bey, burgrave, collector, dey, eparch, exarch,
   gauleiter, governor, governor-general, khedive,
   lieutenant governor, nabob, nawab, palatine, provincial, satrap,
   stadtholder, subahdar, tetrarch, vali, vice-king, viceroy, wali