Of the highest rank

An area reserved for taxi cabs to await customers. / (Britain) The system whereby barristers must accept a brief if they are the first available when one comes up.

Enlisted soldiers in a military organization, as would be arrayed in a grid pattern with ranks and files. / (idiomatic) Members of an organization who are not in leadership positions.

A specified position in a numbered series.

At an important, elevated, or exalted level in a hierarchy or organization; high-level.

plural of flag rank

(nautical, Royal Navy) The rank of a flag officer. / Any of several equivalent ranks in several other naval or other military organizations.

plural of taxi rank

(informal, business) A model of employee productivity in which workers are ranked into the top 20 percent, the adequate 70 percent, or the bottom 10 percent, and those in the bottom group are fired.

(military, chiefly in the plural) A soldier who is not a commissioned officer.