Thayer's Greek Lexicon

 1. a leader of any kind, a guide, ruler, prefect, president,
chief, general, commander, sovereign
  1) a "legatus Caesaris", an officer administering a province in
the name and with the authority of the Roman emperor
1a1. the governor of a province
  2) a procurator, an officer who was attached to a proconsul or a
proprietor and had charge of the imperial revenues
1b1. in causes relating to these revenues he administered justice.
In the smaller provinces also, which were so to speak
appendages of the greater, he discharged the functions of
governor of the province; and such was the relation of the
procurator of Judaea to the governor of Syria.
  3) first, leading, chief
  3) of a principal town as the capital of the region