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Reduction / Stalnaker: E.g. of theories: one describes the terms of a less fundamental theory in terms of the more fundamental - that shows you that the former can be derived from the latter.
Reductionism / reduction / Stalnaker: a) semantically: replace expressions by expressions - relation between theories - b) metaphysically: Relation between sets of properties or facts, not theories. - Reduction may fail: e.g. r. meteorology to physics: basic: physics does not provide a complete description of the world. - Supervenience: helps to distinguish the important from the semantic (irrelevant) part of a reductionist theory.
Ways a World may be Oxford New York 2003