An equivalent rank in other military forces.
The second lowest rank of a commissioned officer in the United States Army, Air Force, or Marine Corps, ranking above a second lieutenant and below a captain. The rank of first lieutenant is equivalent to the naval rank of lieutenant junior grade.
A chief or superior; (specifically, chiefly South Africa) an African chief having the highest status in a region; a paramount chief.
Highest, supreme; also, chief, leading, pre-eminent.
Of the highest importance.