A subordinate.

A commissioned officer having a rank below that of captain; a lieutenant or second lieutenant.

A subaltern proposition; a proposition implied by a universal proposition. For example, some crows are black is a subaltern of all crows are black.

Of a lower rank or position; inferior or secondary; especially ranking as a junior officer, below the rank of captain.

“a subaltern officer”

Asserting only a part of what is asserted in a related proposition.