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Theoretical Terms/TT/Lewis: (T terms) are names, not predicates or functions.
They can always be eliminabted by being replaced by their definientia.
Here: the T terms are names of mental states, the A terms are names for stimuli and responses and also for causal relationships.
Theoretical terms: (T terms) are names, not predicates or functions. But that is not so important. It can easily be reshaped.
A propos I 33 ff
(Add: (s): We gain our theoretical terms from the use of observation terms (A terms) The theoretical terms get a their meaning from a good measure of folk psychology (stereotypes).
Die Identität von Körper und Geist Frankfurt 1989
Konventionen Berlin 1975
Philosophical Papers Bd I New York Oxford 1983
Philosophical Papers Bd II New York Oxford 1986
Cl. I. Lewis
Mind and the World Order: Outline of a Theory of Knowledge (Dover Books on Western Philosophy) 1991