Subordinate, inferior, or subservient (to); = "subaltern". Now chiefly US.

In Aristotelian and scholastic philosophy: designating a science which is subordinate to a higher science from which axioms can be drawn.

Designating both of a pair of propositions consisting of a universal proposition and a particular proposition having the same subject and predicate and being of the same quality (i.e. affirmative or negative); designating the particular proposition of such a pair.

A genus which is itself a species of a higher genus.

Alternate, but tending to become opposite; intermediate between alternate and opposite.

The particular proposition in a pair of subaltern propositions.

To subordinate (to), to make subaltern or subalternate; specifically (in Aristotelian and scholastic philosophy) to treat (a science) as subordinate to a higher science.