This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Lower in position or rank; secondary.

adj. Chiefly British Holding a military rank just below that of captain.

adj. Logic In the relation of a particular proposition to a universal with the same subject, predicate, and quality.

n. A subordinate.

n. Chiefly British A subaltern officer.

n. Logic A subaltern proposition.

adj. Of a lower rank or position; inferior or secondary.

n. a subordinate

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

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

adj. Ranked or ranged below; subordinate; inferior; specifically (Mil.), ranking as a junior officer; being below the rank of captain.

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

n. A person holding a subordinate position; specifically, a commissioned military officer below the rank of captain.

n. A subaltern proposition.

Having an inferior or subordinate position; subordinate; specifically (military), holding the rank of a junior officer usually below the rank of captain.

n. A subaltern officer; a subordinate.

adj. inferior in rank or status

n. a British commissioned army officer below the rank of captain

"The term subaltern suggests an interest in social class but more generally it is also a methodological orientation that opens up the study of logics of subordination."

junior   

commissioned military officer   

subaltern genus    lieutenant   

subordinate    inferior    subaltern officer   

corporal    lieutenant    lieutenant colonel    ensign    colonel    aide-de-camp    cadet    adorer    midshipman    reprobate